I tried the 4cyl spring setup, and i hated it. Car was a sloppy mess to drive. I don't know how long you been running lowering springs and how much you drive the car, but i would not recommend the drag setup for anyone that isn't 100% dedicated to running the quarter.
I couldn't adjust to the new setup, every corner felt like i was gonna crash.
I'd rather run the 1/4 .3 slower than drive around that way.