Johnny - you know, I also tried swapping different pistons. Maybe it's just me, but I hardly noticed any difference in handling. Perhaps othere have experience otherwise.
To All:
I tried the R+2+2 block in place of the F+2 block in front to toe out the front hinge pins (copied the XXX-S design). I may be imagining things, but I swear I got more steering coming out of corners.