Keep in mind, the Gold Hog mats need water velocity and volume. At 2400 gph, you'll need a pretty steep angle to get the mats to work properly. FYI, GH's Excavator Mini High Banker is an 8" wide sluice and about 30" long and is rated for 3000 gph. It has a combination of mats in it.
Doc says over and over again that you must take the setup to the extremes and find the right one for your situation and material. This means setting up the sluice at such a high angle that all the material washes out, but be sure to measure the angle. Then back off from there...reduce the angle to only 5 degrees and check your results...then split the difference between your first high angle and 5 degrees and note the results. Continue splitting the difference, either up or down, until you find the best angle for the material you are running. This is why my first step after buying the Excavator and the Gold Hog High Banker was to run high grade concetrates with known values to see which set up worked the best. I am now running a trommel with a 16" wide sluice X 10' long with UR/BR/RH/Scrubber mat combinations at 18,000 gph! The mats work great, but they are not plug and play...you have to tune them yourself and there is no shortcut for that process. That being said, I like 7 degrees for my sluice and I am recovering -200's routinely. :-)