I really don't understand 1/8th mile tracks. To me, it's too quick. If that's what's in the area though, oh well.
It seems you really need to practice your launch.
Any wheel spin? Find the sweet spot where it won't give you too much wheel spin and a quick shot out of the hole. Once you get that down, you should be consistent, watch/feel when your powerband starts/ends, learn to shift into and out of the powerband.
I dragged legally/illegally in my CRX...fun stuff. consistent 15.6 (1/4 mile) all day long on street tires, with an aftermarket intake, shortshifter, that was it.