I have 2008 Chorus on my bike. The chain rubs against the inner plate of the front derailleur when I'm in the 3 lowest cogs on my cassette. This occurs even with inside limit screw set all the way 'in'. I have finally realized this is because the BB width is too small.
Is it possible to put washers of some kind between the BB shell face and the BB cups to effectively increase the BB width, moving the front rings out a bit?