If you are going up, you are not going forward.
If you look to the Super Stock cars that hold the records, maybe have abandoned the big wheelstand to plant the tires as it is hard to dial. Maybe just skim the ground or raise 6 inches.
I agree that a longer chassis would help, but if the rules don't allow it, make a wheelie bar with shock and springs on the top half to allow a flex in the bars without unloading the tires and set it so that your front wheelie only raise a few inches.
I suggest using the coil over shocks from a mountain bike. They allow adjustablilty on the preload of the spring.