It's was just a thought, but I would be curious to know your results. The Granite has Badlands on it and fairly soft suspension, and it rips through the grass at full speed.
Softening up the shocks a bit might help too. I always like my basher shocks to have thick enough oil to just keep the...
Just looked at the truck, and it may be that those squared off looking tires might be grabbing on the corners during bumps and such. Do you have another set of tires you can try on it just as an experiment?