10% TW to 13% TW...did not seem to make any difference

Thanks all....

1) hoping it is I-10
2) Tried increaseing the WDH so front height was right back where it is unloaded...did not help
3) Tires are Goodyear Commercial T/As and relatively new.
4) Truck is 5 years ole and has 50K+ miles on it....no harm in upgrading the shocks...got a set of 4 Bilsteins for $250, delivered...so will at least give that a try...
5) Hoping most of it is I-10....

Thanks tons...and keep the thoughts coming...