FactorE, I'm liking what you are doing. Laying down the excuses, building a base for the excuses in case you don't do well at the race.
What do you think about shaving a couple of pounds of rotational weight off those motorcycle tires you have on your bike? If you do, it will knock at least 1 minute off your time. Bring your lightest tires with you. We will definitely talk you into riding them. It's time to let it rip. All the riding you have been doing is for this moment. 10-12 miles of easy XC trails. A couple of climbs, no problem. Just think about all the long road rides you have done. This is going to be a slamfest for you. Start drinking extra water starting ..........now!!! If you have any vitamins and minerals, load up. If those cramps continue, buy a 10 pound bag of Epsom salt and put about 3 pounds in a warm bath and soak for 30 minutes. Be careful getting out, you will likely be light-headed. Now remember, all you have to do is follow the course and ride really, really fast!!!!! Oh yeah, smile for the camera. If you happen to see the camera man picture taker, cross one up aout 3 feet in the air, sport a big smile and give him a thumbs up while in the air. If you can pull this off, I will buy you the beers all season.