I hunt in exactly the kind of sites you describe, I hate digging trash but I love to find gold.
I do it this way and have been for the last few years.
I have found 35 gold targets in the 6.5 years I have been in the hobby, some out in the open but most in the trashiest sites I can possibly find because where most people hang out is where you have the best chance to find jewelry.
Basketball and volleyball court perimeters, picnic areas with tables and next to those pavilions, new parks with some trash and older parks with tons of trash...that is where I prefer to hunt more than any others.
Using my Fishers, and my F70 which is going to act like your F75 in most ways, I use all kinds of coils to find gold.
The snipers are the easiest and best of course but I have done it with the big DD coil too...plus a concentric.
I assume you are using a DD coil.
If you rim these things you can avoid digging about 90-95% of these things because you can tell what they are most of the time.
Get a signal, center it under your coil, use quick short side to side swipes keeping the target in the center while pulling back the coil.
When the front of the coil passes over the target and drops out that is one of the easiest ways I have found to pinpoint a target before I dig because at that drop out point the target should be just in front, just behind or just under the front rim of that coil.
Something else happens over bottle caps however...just before the signal drops out there will also be a drop in the numbers and he tones from that usual dime or quarter area lower.
On older steel caps they will drop down to iron or close, on the newer ones they might not drop that far but there usually is a drop....coins and other good targets don't do this, they stay consistent till the signal goes away.
Not all caps will act like this, the old steel ones that are flattened, shallow and laying perpendicular to the surface usually act like coins and might not drop, for one reason or another the newer ones can stay solid like coins too but you can eliminate 90-95% of them this way and just move on...quite a difference when you hunt sites infested with these things.
If you are truly looking for just gold these shouldn't matter anyway because unless you come across something good and huge like a $20 gold coin or something large and high karat gold usually won't come in that high anyway.
As far as those tabs of all kinds they can be solid too but again, for me, many usually aren't and can tell me in some way they are junk like a little too much jumping in the numbers and tones or turning and hitting them from 90 degrees the numbers change on both the first pass and the backswing.
Many could be solid too and right smack dab in the gold range so those you must dig but the jumpy ones I quit digging long ago.
The good thing is all good I have found has always been solid and repeating from two directions in both good soil and bad and in open trash free sites or insane trash infested ones.
All of my gold has been at depths if 5" or less so real deep ones can act different but I don't worry about that.
That is usually what I dig nowadays those solid signals wherever they come in but the rest I rarely do except under special circumstances.
Can I miss gold doing this high percentage method...sure, but since I started doing it this way I cut out 80-90% of all the volume of trash I used to dig in my early days and found much higher volume of good targets after I started doing it including gold.
I won't dig everything to find that metal or anything else and I would just give up the hobby if I was forced to do that but luckily nobody is.
I am not saying you should do it this way or anybody else, if you want to dig a ton of trash more power to you...but I just can't/won't anymore so I changed.
This is an 8.8 gram large 14k religious pendant that is so big and blingy my wife doesn't want it....which shocked me.
View attachment 1468570
It was found in an old park where for the last 90 years evidently everyone that came into this park forgot what a trash can is or how to use it.
This area had to be an area where people sat and hung out for decades from the huge amount of pop tops of all kinds, screw on tops, foil, can slaw and both beaver tail and sta tabs that were here from shallow down to all depths.
In this site I avoided most of that junk and still dug old wheaties and lots of modern zinc and high tone coins.
On one hunt I was still avoiding most but came across a solid signal that was a 41, exactly the same as a million beaver tail tabs in this park and the same as about 10 in this area I left in the dirt but this one sounded solid, the numbers stayed pretty stable and in a range if about 2-3 and jumped no further and acted the same when I turned and scanned it from 90 degrees.
It was no tab.
Most everything is jumpy in my difficult dirt especially as you get deeper at as little as 3" in depth but even though this was 3-4" it was solid, I count on gold acting this way and thank goodness for me it always has, so far.
In my trash pouch I had a few beaver tails but most I let lay there...but not this one.
Probably sold for $500+ when it was new and i still have it because it is to nice to melt.
I have many more experiences that are exactly the same.
This 22k ring was found in January after I had been stuck in the house for weeks due to winter, the ground was still frozen most everywhere but I found a sunny area where the first few inches were defrosted.
I was digging every solid signal I came across just to dig anything that day, even trash that even though semi solid I pretty much knew was trash but I was still avoiding the real jumpy stuff and everything deeper than 2-3" because it was still frozen.
Then another 41 high tab signal.
Right near the 3" depth limit according to my detector but it was solid so I had to go after it frozen soil or not.
Again...not a tab.
And there are many more examples just like these two in my career.
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Another reason I love going into these high trash areas is because so many avoid them.
For those that have the patience to learn a few new skills, the control to not worry missing something here and there and the knowledge that even if you do there will always be another day and another hunt this method might work as it does for me.
Sorry, just had to ask, looks as bad a a set of janitors' keys! And as heavy too! As far as the advice, looks like you got a lot of it and see nothing I could add. Good Luck!
