FJBen
SILVER Star
I guess our interpretation of stiff will have to vary 
I have J's on the rear of my rig. It's definitely not a 5.5" lift. It's just slightly taller without the spare tire setup. My rear bumper is light and we took it off to rebuild it. It went up maybe .5" and thats a very light rear on mine. I didn't think it rode stiff at all.
I'd be interested to hear what your hub to flare measurements are right now. I'm running Slee 4"/ OMEJ rear.

I have J's on the rear of my rig. It's definitely not a 5.5" lift. It's just slightly taller without the spare tire setup. My rear bumper is light and we took it off to rebuild it. It went up maybe .5" and thats a very light rear on mine. I didn't think it rode stiff at all.
I'd be interested to hear what your hub to flare measurements are right now. I'm running Slee 4"/ OMEJ rear.