Very good advice above. I was going to recommend that use utilize the ground notch feature to eliminate chatter and falsing from bumps, but I see you do that already. There's no need to run zero disc on the Deus. You're only making it more difficult to pick out good signals from iron, and gaining nothing in return. I like disc set at 6.5 to 7.0 in most of my programs. Also try notching 97-99, which will knock out some falsing also from big iron. Even a silver dollar will be mid 90s, so you aren't missing any targets doing this. I've heard some folks just have a "hot coil", where they can't run sens up past 90 or so. If you have to turn your sens down, keep you TX on 3 to regain some depth.
Hope this helps. Happy Hunting!
Hope this helps. Happy Hunting!