Then either

1. There isn't enough tension on the cable to pull the cage to give the clearance needed. If you have a barrel adjuster. Turning the barrel outwards incrementally will move the derailleur cage further outwards.

2. The high limit screw is still in too much, and is preventing the cage moving outwards any further.

or a combination of both.

Also, If the outer cage edge is not perfectly parallel with the chain ring. It will cause rubbing rub on the chain. So make sure it is properly aligned.

If you have a braze-on style FD. Make sure the support bolt is touching the frame. So there is sufficiant stiffness of the FD and there isn't any unwanted flex or movement when shifting.