How stiff can you go, Rear springs Options

[brilliantrot]

So I am just begining to see why people always sa race cars are never done. I just ran my first autocross on track tires (Nitto NT-01s) and now my previously perfect handeling car lifts front wheels way into the air. Corner workers were saying as high as six inches!!! Now I am NO expert but this leads me to believe that there is still a considerable amount of time to be had if I can keep the wheels on or alot nearer to the ground. My question is how stiff to go in the rears. I currently have #140 Weltmeisters on the back and stock front torshens with a H&H 19mm ajustable front sway bar set one hole from soft leaving two stiffer settings (four holes total). I am thinking #175 or #200 2.5inch springs on ajustable perches. Any suggestions? Will ajusting the front bar to full stiff be enough to counteract springs this stiff? This is for a strictly autocross car that only gets driven to events and on the occassional sunny day. Also it has a six pt. cage.
Any input will be appriciated since I would only like to buy one more set of springs.

[Chris Pincetich]

Are those Nittos the ones with all the curvy grooves as tread patterns? With a tread wear rating of ~100?

My 914 is a lot like yours, but with 195/50 Dunlop Sport tires that I bought before I knew would be such an AX junky. New tires are in my future, hopefully some that allow me to drive to events (10-70 miles freeway cruisin) w/o worries and still get good stick. I looked at the Nitto photos and info and they seem pretty good. Any comments on ride noise, value, fit vs. other 205/50s etc are appreciated (IMG:style_emoticons/default/beerchug.gif)