I've got a Trek 7100 that has an issue with the front break rubbing but it's a bit strange... I've adjusted the brake and it tracks fine if I spin the wheel, it clears no problem. But once I get on the bike I get a rubbing mainly when I stand up on the pedals and push with alot of force. I can lower it by increasing the pad clearance but ultimately it gets to the point where I start to sacrifice stopping power to reduce the noise. I'm not quite sure what could cause this but it seems to be related to me loading the bike with my weight, I'm about 195-200lbs so I'm not a lightweight.
Firstly, is this even something to worry about? Its not enough rubbing to cause noticable friction but still I think I'd like to solve it.