You will not lose big gold over the bazooka grizzly if you add the 4 mesh screen unless you have either crazy angle or water flow going into it. The surface of the bazooka has enough grip and acts like a miller table. Anything picker size or even big flakes just stop almost where they land. If you run it real fast the bigger gold will make its way back to the wire opening and sit right before it. Notice the size of the gold compared to the 4 mesh screen. In most cases gold half the size of the screen (8 mesh) is sticking to the bazooka slick plate due to its high weight and the grip of the plastic. Nuggets will stand out clear as day.
I am sure I could find more examples of this in my videos as well if you want, but hopefully this is enough to show you not to worry about it.