Wheelie trouble with a sport?

i have a sport with the battery and RX up front,22/72 AND masher 2k`s and i can still pop the front up a bit..And thats with the pro.15 and a MIP 360 pipe
(But before i had those SUCKY dirt hawgs on it and all it would do is spin and go)

*With SAND tires in grass it will wheelie all day*