I have full drag suspension on the car, I just think I had the Strange Adjustables set a little too soft. I was unloading the rear tires, which doesn't help either. I think I may also have too much pinion angle in the car, and it's hitting the tires really hard on the launch, which would unload them.
Right now, I'm really limited by the 555R's. I'm picking up a set of Hoosiers on Friday, and going back to the track on Saturday night with a few small adjustments and the new tires.
My 60ft's on the 555R's are in the mid 1.7's right now. 1.72 being my best, but typically 1.74's. I know with the Hoosiers I can cut that down quite a bit though, along with tightening up the front so it doesn't drop as quick, and possibly softening up the rear so it actually squats.