so I am running a 18 donzi and a 350mpi supercharged pushing 500hp. I am running 85 mph now with 27's and was wondering I have a set o 29/and 31 and can I try to change it up with 31/29 or31/27 has any one done this or is it to hard on the gears. And yes I am going to do the padded bottom over the winter.