So, wait a minute now. You were running it in TC2 with Low power and you determined that the tires were slipping because it "seemed" like the TC kicked in? There's your problem!
Did you actually see the TC indicator showing you that it was intervening? Did you feel the tires moving/sliding at all? What were the road conditions - dirt, leaves, sand, oily, tar snakes, etc? How hard were you riding?
The TC will intervene predictivelt as well as a reaction to an actual slip. It won't wait until the tire is slipping all the time or that will be too late to save anything. Especially in TC2 and TC3. The algorithms will try to predict the conditions under which a slip can occur to preemptively intervene a bit. In low power mode, the algorithms limit the engine power by limiting the fueling and ignition timing on the G4 and the throttle servos on the G5. How it does that and what you actually feel are different things. If the engineers calculated that for that particular power mode, that particular TC level, that much lean angle, with that much throttle, then the system will dial it back for you to potentially stop the wheel spin until it actually sees a spinning and intervenes completely. TC1 won't dial it back nearly as much, but TC2 and TC3 close that envelope to dial it way back way before it spins up.
I have ridden the Dragon on Q3 and Q3+ in Full power with TC Off (because that's the best way to ride) and got no "slipping". I can't get more than about 2,500 miles out of a rear Q3 before they are at or below the wear bars. If your tires are worn out, that's part of the problem and a contributing factor. But I suspect that you didn't actually slide anything and are assuming that you did based on the settings and what you "think" the result should've been. If you actually slid the tire, you'd feel that as the TC was trying to correct and control it.
PS - "Feeling" the heat of a tire is meaningless unless you recently calibrated the palm of your hand. I know those mechanics all use bare palms to feel how sticky and hot the race tires are in the pits. Carcass temps are way less important than the surface temps on the outside of the tire. I can tell you that after the tire sits out in the sun, the surface temps can get scorching hot on my hand at 126 deg F compared to where it should be in the 180 deg F range on a tire warmer. It's all about the "feels".