Mike, you should also check to make sure your speed control is actually hitting full speed- most have an indicator light that turns a different color or blinks when it reaches full throttle.
Seems simple, but a very experienced A-Main level driver (not me!) discovered this past weekend that this was the reason he was so slow. He'd somehow reduced the forward travel on his radio and was only getting part throttle at full trigger pull.
Wish you had come over to our pits this past weekend, we'd have fixed you right up!