I have a Fuji Finest with sora components, triple crank. When in the small or middle chainring and the smallest 2 or 3 cogs, the chain rubs on the front derailleurs outer cage plate. Also when in those gear combinations if you spin backwards the chain jumps badly. In any other gear combination it runs perfectly. It shifts perfect. Obvious solution is more cable tension, but it is already at its limit. If you put any more tension on it it tries to jump to the next gear.
The derailleur is set up correctly. Outer plate is parallel with chain, tension is correct, limit screws are correct, outer cage is 2mm above chainring.
Thanks in advance