With anything over a 1” spacer (and the 6112’s fully extended) you’re gonna start running into geometry problems and UCA’s hitting the springs and other ****. People on here have been running 3” of lift in the front without correcting geometry, but that seems like it might be the absolute limit.
I feel like a geometry-correcting kit (BDS 4” or any kit that comes with a diff drop and new knuckles) would be the best bet. Then you would have the option of 4 - 6.6” of lift, and it should ride and handle exactly the same as it does now.