well the seat tube is a 31.8 with a braze on mount that makes the front mech sit to far out (have tried several mechs and doesn't make any difference) this means that the front mech wouldn't get the inside ring properly and when it did it was rubbing in the easier gears. the way i overcame this was spacing out the bb on the drive side, it works fine but basically the mech is in the wrong place. also the rear brake mount is slightly too high which means that the brake pads would hit the tyre even on their lowest point. i solved this by very carefully filing the slots longer in the brakes.
i know it's the frame coz its running a mix of chorus and record and at different times has been built with 8, 9 and 10 speed versions and all the problems were there regardless of how it was built, it's also the same with shimano bits.