My best recommendation is to buy Andy Sabisch's book (sorry if I butchered the spelling, but his book is great)
Henrikras makes a good point about increasing your GB. I alway hunt with it a couple points above the actual Ground Value to help silence that chatter.
I turn down the sensitivity when in trash, also I run TX at 1 (TX 3 will only give you a couple more inches anyway)
I run reactivity at 4-5 and hunt slow (very fricking slow) when I get a good signal I walk around it, most of the time it can only be heard from opposite directions because of all the trash. Sometimes there is so much trash that you cannot "X" the pinpoint, you must simply wiggle the coil towards you until it silences and it is under the front tip of the coil.
Under the Reactivity window, you can hit the "expert" button, then use the Silencer. Depending on the noise I usually hunt with it set at 1. (remember, we are talking about hunting in the trash, you can adjust it more or less to fit your location)
I run my discrimination up to about 10, using full tones, and notch trash according to where I am. If I'm hunting an empty lot with no good history, I notch lots, but if I'm where I think I can find cool stuff also, I'm in for a day of digging and also getting lots of trash.
I keep my iron volume down when in trash, there is always enough to listen to. So "ZERO" is my choice unless relic hunting.
Audio Response I leave around a 3, if I'm wanting to go deeper, and think I may miss lighter sounds, I will increase this number. It won't help your machine detect any deeper, but it will let you hear the deeper sounds a bit louder.
Hope this helped? I have good success in trash, and in areas that have been hammered by other detectors. If you are near Phoenix, come on out, I will take you hunting. Good targets are easy once you know what to listen for. Use your ears.
Oh, pull tabs jump numbers more than coins do. You will quickly be able to determine which to dig. Sometimes you will be wrong, but digging nickels is my favorite, so I tabs just on the chance that I'm wrong and it may be a nickel. Typically, when I see the numbers jumping around, it is almost always a tab. Nickels don't jump numbers much.
Set up a bottle cap program (search this forum) or let me know if you can't find it. I always keep that program available so that one push of a button, my detector drops to 4khz and has the silencer up to 4. This either kills that bottle cap signal, or it will cause the bottle cap to read a higher number than it did while I was hunting at 12 khz. You will get an occassional cap that sneaks past, but no often.
Once you put some time in with the Deus, you and your shoulder will be glad that you aren't toting all that weight. Yes, it may take a while, but you will soon be pleased.