My thought is that OP went from a E tire to a G tire, 80 psi to 110psi (even tho he's at 90-95 psi). G tire is designed for far more weight than he has thus causing mre bounce due to a stiffer tire. I also agree on: does he have shocks? Also, perhaps adding (unless on already), Mor-Ryde CRE 3000 susp and wet bolts.
Like Dutch, our Big Country is 41' long and weighs 14k dry, 16k loaded and has Sailun tires aired up to 110. Rides great and nothing has broke. We have a cutlery set that spins around on counter by stove (on a slide) and since we put it there 2 years ago, it hasn't move.
So I feel that OP needs to go back to a E tire and 80 psi.