Here's the slap in the face
: (no offense, only trying to help)
Throttle control is paramount in any from of racing. Even in touring, though most racers running touring don't have any throttle control. That way none of them will ever become top racers. Mashing the throttle coming out of the corner upsets the car, making it loose acceleration and lets your car travel unneccessary distance, while consuming unneccessary power. Using a smoother motor will only mask your lack of throttle control, and probably make you slower overall. In the long run you'll be better of running a hotter motor and learning to control that finger.
It takes time and dicipline, but you'll become a better driver overall, in any class of racing.
Try this: run your car with 75% of throttle MAX. Keep at least 25% of throttle, even in the slowest corners. If you can't make the tightest turns, build in more steering. You'll find that after a few pack's practice, you'll be just as fast as you were before, while having much more runtime.
At that point you can gear up, and really become faster.
This is what I've been trying to teach myself during last summer season, and it has really paid off: I beat the german Pro10 top using basic electronics against their high-zoot stuff at the end of the outdoor season.