I was reading this post since I was getting chain rub on the front der when high at the front and smallest 2 cogs, its an Ironman 6 to 7 speed conversion with Sora brifters. After what seemed like tweaking every possible thing, der alignment, height, bent it out a little, had the cable tighter than heck, chainrings ok, re-bent a spider arm at the screw hole since it seemed .5mm high when sitting on glass, check BB, ...then FINALLY loosening the cable wire and re-doing it did the trick. Must have allowed the der to move farther outward. Ha-ha on me. Took 3 weeks to figure that out.