I bought an Axiom Streamliner Road DLX rack (the one that connects at the brake bridge) for my new Salsa La Cruz since the bike doesn't have rack mounts on the seatstays.

I put the rack on last night and it seemed ok, but this morning when I put a pannier on it and headed out the door, the weight from the cargo kept bending the metal bar that connects the rack to the brake bridge. As a result, the rack would rub the tire. I tried bending it back into place, and it would be fine for a minute or two but as soon as I hit a bump, the rack would bend back down and hit the tire. Before I got too far from home I went back and took the rack off and threw everything in my messenger bag instead.

The rack is supposedly rated to 110 lbs, but I only had 15 pounds on there, max. Anyone else have this problem? Any suggestions for fixing it?