Your fan clutch isn't engaging early enough, basically. If the truck isn't running hot in any other way one fix is to wire up an auxillary fan for the AC condenser.. this sits in front of the assembly and turns on any time the AC clutch is engaged. Just provides some help moving air over the core at low vehicle/engine speeds. The other is to rebuild your fan clutch with thicker fluid and adjust the built-in thermostat to open sooner. Will make more noise at low speeds and probably reduce mileage slightly.. but ultimately it'll pull more air over the AC condenser at low speeds and help AC in those conditions. Search "landtank" fan clutch mods or buy one pre-modded from Landtank or NLXTACY
And for the record.. if the AC compressor is still operating while it's blowing hot it is realllly bad for that unit.
If you've already done the fan clutch tweaks sorry.. didn't read all the way through this thread.
I need to get down to galveston.. been years. Only ever even tried to surf once for about four hours (in australia).. is there anything decent to try and learn on down there?
I think this is likely your issue too, fan clutch. You can try shifting to neutral when stopped with foot on brake and then rev the motor up to 1200-1500 RPM's. If that keeps things cool then I would proceed with fan clutch fixes.
Edit: also forgot to mention, if you are happy with the ride quality on your truck then I see no need to invest in a lift. I would just throw some coil spacers on and call it good.