Put a radial on it and enjoy going faster and not dancing around.
I think its tire circumference since the only thing that has changed is the swapping in of a spool.
Considering drag radials for my next tire purchase, my friends car launches like a fiend with them. Slicks don't bother me though, some walking around the track is just part of the experience in my opinion. If the rest of the car is tight it really should not be a huge problem.
