I just put on 20x11x10 Sand Sharks and hit the dunes here in NV. They are taller than the stock wheel/tire combo. The bottom end did suffer, I can feel it. Should of stayed with the stock size. I need more power, plus I have only 12 hours on it so still kind of going easy. Anybody have any noticeable powergains after break in and valve adjustment?
PD

 

I would go w/ a less aggressive paddle. By that I mean a lower paddle height or less paddles. It takes a lot more power to turn paddles. Try pulling the end cap off, the lid off the aibox and snorkel and rejet to a 145. If you want more low end then that by a Slip on. Mine works very good down low. Better then my brothers full Yoshi. Hoped I helped. Good luck.