I've spent a lot of time playing with role centres, weight and drop suffering from the same kind of issues. Then I put the 116t six hole pistons in and things are much better.
Rear grip and side bite were much improved, and the car got through the corners much quicker, when grip is low. Before with the kit setup the rear was so stiff even with 27.5 oil, it wanted to breakaway in corners and never settled on landing. Having always run a B4 using 2 in front 1 in back, I've never had to think about piston setup, because it was never a issue.
So I'm no expert but I think maybe putting the kit 1 pistons in the rear might help due to the holes being larger? or getting some six hole pistons might be worth a go?
I'm sure those who really understand all this can give clearer advise, but opening up the holes in the rear pistons certainly worked for me.
As for the tire thing I'm not sure.
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