Will,
Sounds like you have some great ambition, which is good. You may want to do some research but I'm not sure if Test Pilot School (TPS) is open to reservists. Here is the reg that may address that question:
http://www.e-publishing.af.mil/share.../AFI99-107.pdf.
One last little tidbit before bed; Flying is a vice much like drinking, gambling and women of low morals. Once you have the taste it can be hard to just "let it go" as you say. In order to be respected and rise above the average mouth breather a good part of your life will be spent studying tech orders, systems, tactics, employment, mitigation etc... With all this time and effort comes addiction. Aviators like to fly, it's a chance to check out from the drudgery gravity provides. Also, most people dig flying into combat. Employing your aircraft to the fullest of its capability is what we all drool over, it's why we spend countless hours studying widgets and nit-noids. That opens up another whole debate as to why you're doing the reserves. Dig around and you'll find all the preachy posts about why to join the Air Force. Spot on, every one of them.
Best wishes!