Probably aligned to stock specs which are meant for bias ply tires and produce tons of understeer (at least with radials).

Try following David's recommendations.

http://www.pozziracing.com/first_gen_suspension.htm alignment specs.

If you're running factory arms you might not get more than +4 degrees caster (just tell them as much as possible). The camber shoot for -.5 degrees and toe-in as he specified. GlobalWest sells an offset shaft for stock arms to help add negative camber without a ton of shims.