Thanks for all the help, everyone. As mentioned by Dibbs, RapidRise in and of itself works fine, but it blows chunks when you've been riding normal derailleurs since RapidFire first came out! I'm still missing shifts, four years on, as the muscle memory is still for normal RapidFire.
So, next two questions. Thinking about XT or XTR Shadow derailleurs:
1) Any real difference between XT and XTR, other than bling factor?
2) I'm running a pretty normal 22/32/42 up front and Mega 9 11-32 on the rear. I never go into Big/Big or Small/Small gears, so can I get away with a "Medium Cage" derailleur, or should I go for the "Long Cage"?