If you are running street tires...don't bother trying to hook no matter what suspension you are running. Street tires don't hook and unless you are racing at a track with incredible prep, don't expect to cut crap for 60ft. times. The more power you make, the worse they get.
To answer your question, the Eibach ProKit Springs will affect your weight transfer, but I belive its such a negligible amount, its not worth worrying about.
I have the ProKit on my car and have cut a 1.86 60' on 17" Nitto DR's. If you're having problems cutting good times...get some tires!!! Track prep can make a HUGE difference as well. Be sure to try to make it to the track when there are guys with slicks running and they are applying VHT...and hopefully avoid too many street car tires (especially teh front wheel ricerish type).