Hey, I am running my rustler vxl with a revo spur, 14/40 gearing, fiegao 8l, mm and 4s 4000mAh 20c lipos... It ran great, i always had instant wheelies, no matter the speed. now, i can have the slipper as tight as possible(as i always ran it) and now i cant wheelie at all! Is this just the slipper assembly wearing down or is something not assembled right?