I would guess that you are unloading your front wheels so much under acceleration that they are loosing grip and spinning.
I would probably try running stiffer springs in the back, and/or putting in a heavier weight shock oil in the rear, this should stop the rear sus from compressing so easily allowing more weight to be kept up front.

the other option would be to try being a little easier on the throttle to get the speed up before you punch it, this shifts less weight to the back of the truck, helping keep the front down.

ahab