Lost my way on Setup !
 

Short question, but i've lost my way and looking for advice

Was at the South West Regional at Mendip this Sunday with my 4WD Schumacher K1 Aero.

The car is just so unpredictable over the bumps and the loose, its on a real knife edge.

Please don't get me wrong i've been racing for some 30 years so can usually get a half decent setup to work, but Sunday, just couldn't find a happy medium.

So looking for any advice.
Current Setup attached

http://i1083.photobucket.com/albums/...psfimojyth.jpg

Nothing looks way out on there but things I would try include
A rear ball diff or 20k in gear diff
Drilling rear Pistons to 1.6mm to reduce pack, same oil and spring
Playing with antisquat? If it's wanting to swap ends on corner exit then increase
If it's got plenty of grip on exit but is kicking up the rear on the bumps

Hope this helps.
If not let me know I'll try to help further