I wouldn't start any lower than 40 in the front. I think the few short runs I took on my stock all-season Conti's I ran 40F/40R and that worked ok (well, as ok as an all-season tire can work). On race rubber (which is non-stock size tires on stock size wheels) I've had to run in the neighborhood of 47F/45R. This all with a setup slightly different, but very similar to soloIIracer.

The car is going to be tough on front tires...keep a close eye on how far you're rolling them over.

And don't forget to turn the ESP/TC off...or as far off as you can get it anyway.