Side stepping the clutch

How much ET do you lose? I have to take off at 5800 to 6000 so it dosn't bog. I've always been afraid to side step the clutch. I usually try to lift the pedal as fast as I can. I have a brand new Hayes clutch and I haven't been to the track since I put the RPM heads on. Do I need to worry? I run it at the track on slicks. The last time it was running 12.70's at 108.

Fred B