Acetron GP / Delrin / Del Alum, then focus on spring rates and shock valving to soften the feedback?
Fresh rubber is good but as you noted the size equates to mount point deflection.
I prefer the feedback more rigid bushings deliver and can tolerate the negatives as it's not a daily driver. I never put these bushing on my Tundra truck though.
Maybe Speedtech or RideTech will chime in.
