Finally decided to bite the bullet and get it checked by an indie.
Turns out it was the fuel pump; it was heating up and cutting out intermittently.
Makes sense now that it was mostly doing this in warmer weather, and when the fuel tank was at a low level. A couple times it did it on a low tank, and I filled up the tank and the problem stopped. Go figure... cool gas cools fuel pumps.
I replaced it with a pump from Schucks, but I can actually hear it running now, so I will be ordering a Japanese one later (one of a few brands that I ran across on the internet), and returning this one...
I tried checking the fuel pump myself, but I was not convinced my method was sound... pretty dumb, but I removed the rear seat and shined a trouble light against the access hole for the pump in the gas tank. The problem did not occur, and it is good that I did not rely on this method and cross that one off my list. The fuel pump sits lower than the hole, so it makes sense this did not work. I still suspected the pump to be the problem, but I figured I would have someone else do the diagnosis and just fix it myself.
Anyway, I hate it when people ask for help and go fix it, then never come back and post what they did to fix their problem, so here I am.