OP...you have been beat up enough on your Truck..so I'm not going to jump in there.
Let take a look at your hitch first of all. Get out your instructions and set the hitch up correctly. As said before, nose down is better.
We had someone come on here not too long ago with similar handling issues with the BlueOx Sway Pro and it too resetting the hitch and adding more tension to straighten it out.
You are heavy, you know you are heavy...take those tires are look at the sidewall...air those tires up to Max PSI...
Then tow the truck and trailer to a scale and figure out what's going on weight wise, you may find that the tongue is too light, or too heavy for the spring bars...etc etc..
Thanks!
Jeremiah
TV-2022 Silverado 2WD
TT - Zinger 270BH
WD Hitch- HaulMaster 1,000 lb Round Bar
Dual Friction bar sway control
It’s Kind of Fun to do the Impossible
~Walt Disney~