Flar makes some good points as well. The shifting technique can also lessen the "impact" (ha!) of this backlash. I'll try to get a video of a proper upshift to show how smooth and gearbox friendly it can be. I'll have to get creative with the GoPro cameras...
(Waking up an old thread due to a nagging memory...) Brian, did you ever get around to making those videos? (Not that I have any great ideas on the creative videography required there...)
Not yet. Greensprings Highway had snow up at the top until the last 2-3 weeks. I've done some rides up there recently, but usually leading a group, so not the best for video. This is just the excuse needed to charge up there on my own. It'll have to wait until next week though, 'cause we're leaving for the track tomorrow morning!