Sorry to hear of your frustrations.
I'm curious as to how the mid tom was failing. Would it just not trigger? This may sound stupid, but I've had trs jacks work their way out of a plug which would then give me some strange trigger results. I remember thinking, "WTF is going on?!?" Then when I realized the TRS jack came out of the plug (or it wasn't all the way in to begin with), all was good.
I think Hellfire is correct.. VST can be challenging. I've had zero experience in that area, but from what I've read here and other forums, the learning curve is fairly steep. My personal theory on the matter is while it is believed that a drummer create the perfect ekit with VST, there's 3 pieces of equipment... kit, dumb brain (ie trigger I/O), and PC. That's one more piece of equipment for error. Again, take it with a grain of salt, as I have no experience in this arena.
anyways... good luck!