Have you ever timed roll-on performance of the bike and trying it different ways? Reason I ask is even with a stock Rocket like mine against another bike, being in a lower gear (downshifting) doesn't really show much of an advantage when I take off from a rolling start.
For example, when rolling on against my Valkyrie, it has to downshift in either 3rd or 4th just to keep up with the roll-on power of 5th gear on the Rocket. When I downshifted the Rocket to 4th, there wasn't a noticeable difference of acceleration against the Valkyrie. As far as time frame it was a big advantage cause I didn't have to shift from 4th back into 5th. It's very brief, but still saves time.
Did I lose everyone with that? Just curious if you tried starting in 2nd from a 20mph roll instead of first, utilizing the gobs of torque and saving yer 1-2 shift time.