I must of hit 60+mph when that happend. And sinds they are stickier, you'll be able to hit the topend alot quicker. My rear setup was set to sqaud a bit on takeoff. No wheelie bar was needed with that setup.
I have a pair of Proline Powerstroke shocks in the rear which are dual-rate shocks as well. Although before I flipped the transmission around it would still wheelie sometimes. Not with the hard HPI's, I used to have a pair of Road Hawgs. Probably gonna buy them again; they were good tires. I'm curious, how much does your truck weigh with the stock chassis?