Simply put, you can’t really beat the additional surface area of a larger piston. Sure TWO pistons is good, but I’d still rather have one larger piston over two “smaller” pistons.
I’ve setup TTB trucks with basically every setup you can think of from 2.0” coilovers and 2.5” bypasses to 3.0”s and 4.0” bypasses. I think a very good happy medium across the board is the King 3.0” IBP shocks with compression adjusters on the resi. You get both position sensitivity and speed sensitivity, you can have a good amount of free bleed for chatter, insane bottom control with the needle locking out the main piston, and tons of spring options with the longer 3.75” coils. Plus the external adjustment of the resi clicker.
Starting with where you are at, I would say things progressively get better starting with;
-Single 2.5” non IBP coilover
-Single 3.0” non IBP coilover
-2.5” coilover and 2.5” bypass (I’d argue some points that the single 3.0” non IBP could be better than this setup, so kinda a tie here)
-Single 3.0” IBP
-2.5” coilover with 3.0” Bypass
From here, anything larger in diameter just helps across the board.
If you already have a bypass, just add a bypass. But there was nothing quite like riding in a big squishy F-150 with a single 3.0” coilover per wheel, no noises, just major smashing big stuff and a lot of laughing and smiles as the truck just ate everything in front of it. I miss Clifford