The 4600s will hold high voltage longer than the 3300s. You know when you 1st start out and how much punch you have - the 4600s will give you a little more time with that extra punch before they start falling off. Yes it may may you a little faster, how much don't know. Can you borrow a 4600 pac for a practice session? That would be the best way to get an idea of what 4600s would or would not do.

A little of that 2 sec faster lap times for the A Main guys may be due to batts - if they're running NiMh, they are prob maintaining them at optimum condition by discharging and conditioning. But most of that 2 sec time difference is their skill level vs yours.