Originally Posted by odpurple

One of the main reasons front tires "gum up" is from heating up due to excess scrubbing. Too much rear traction may cause you to use too much steering (dual rate) which will heat up the fronts and cause the tires to glaze over. Try to get the amount of steering you need with as little steering input at the front as possible, this usually means freeing up the rear with a harder compound or stiffer set up. This is critical in stock classes since scrubbing tires slow the car down in the corner.

In Vegas I ran Gray rears and Lilac fronts. That was plenty of front tire for me and the rear was still stuck