that is 100% about tire pressure and traction. the more air in the tires, the easier youll be able to spin them.
at hillclimbs i run my tires at 1/2 pound.. yes, youre reading that right.. half a pound. they are nearly flat and offer the most traction possible..
as far as the original poster is concerned, i would say you dont have enough power to be running those tall ass tires.. all you have is a dune port.. i think you need a smaller tire or youre gonna have to drop the gearing down more. maybe 14/44..