Whats your tongue weight and what hitch are you using? You say you're maxed and can't get the front end down anymore. That says your WDH is too weak.
FYI air bags won't help the front of the truck.
Don't worry about the rear of the truck. It is what it is when you get the front set right.
Floating fronts mean you don't have the WDH cranked up enough. Are you needing to raise the rear of the truck to hitch up?
I agree there are a couple of things to try before new shocks. The tires is the only one I have not tried yet.
MC
Pump them tires up and try it, like I mentioned in your other thread. Free test.
You can spend all day and a weeks pay dialing it in "perfect" and then it wont be perfect...