hideeho
I had a similar problem (loose on power, but good off) recently & solved it by raising the anti kick a good bit (1* to 3*), lengthen the rear arms (inside on tower, no washers, top outside on hub), put on the avid carbon hub tower &, for the biggest effect, turned the current limiter down. this setup locked the rear end in wonderfully! it had just enough rotation to get it around a hair pin.

I also got hold of a cheap ($7.50 shipped ) t4.1 chassis, so I gave that a try also. 1st thing I noticed was it handled like it is in slow motion (which at my skill level is a very good thing ) after playing with the tunning in morning practice I got it down to just a touch of push. that allows me to late brake & get back on the power MUCH earlier (with higher current limiter settings), start the rear rotation & catch it & launch much easier. I can see where a driver with more skill would prefer the shorter chassis, but for now this chassis is wonderfull for me.

almost forgot, what put the handling over the top w/ the t4 chassis was a shorty lipo all the way to the rear. I didnt like it as much in the front & didnt like the full size lipo anywhere.