Originally Posted by FBinNY

Yes, the cage is narrow, which is why better Shimano shifters have extra clicks for fine tuning. Sram and Campagnolo don't have actual indexing FDs and allow the rider to trim the FD cage at any time.

If you cannot span the entire cassette from a single position, set the trim to just barely clear the with the sprockets that are actually used with either chainring. ie, the outer should just barely clear on the outermost, and clear with the middle rears though the inner one or two may rub (but you don't generally ride crossed over anyway, because it's hard on the chain). The middle should best clear with the middle and inner side of the cassette, and the granny is trimmed for the inner rear sprockets.

That should allow you to get all the combinations you'd normally use, though it may rub on ones you wouldn't.

BTW- this is a PIA to dial in trial and error so consider getting an inline adjuster if your levers or frame mounted cable stops don't have built in adjusters.