I don't think slicks would help you. Usually a slick is a taller tire and takes gear away. I have 4.10's in my car and run a 28 inch tall tire. That makes it like I'm running a 3.73. My car actually runs better times N/A with crappy street tires on it than if I run with the slicks. I think you just need some time with the car. It's alot harder to run consistent at the track then people think. I've had days where I brought my car to the track and ran .5 off my best times. I'm a good driver and that just showed me how much weather and atmospheric conditions have to do with the cars performance. Good luck and don't be discouraged.
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My 94 GT