I've had the same tip on for 20-25 hrs of play now, and I've noticed the same thing. Only when I use Master, though. At home I use Taom V10, and it doesn't do the same thing.
Yeah, I reckon that's true. You're right that it's hard not to, though. Swiping my chalk a few times is just kind of a habit now when I'm looking at the next shot.