The biggest difference I noticed was in power between 32s and 33s. 33s put you right below the power curve with 4.11 gears, making the truck pretty sluggish on hills.
I have a 1.5" BL, and had OME heavies for a while until switching the rear coils out for heavier OME Prado coils. My total lift is around 4", so slightly higher then your present setup.
Hang on for a minute while I vomit pictures all over your thread...
Here are some pics of my truck in 32s: