You probably need less antique brake shoes Kool Stop Salmon compound, Eagle claw..

on front, maybe the thinline type as they are long tail style,
and you will have more clearance in between rim and inside of fork blade.

wiping the aluminum down with a scotchbrite ans some simple green would take odd oils that may have gotten on there ..

Throw money into a longer arm L shaped brake caliper perhaps? IRD Cafam, perhaps,
or older Deore's.. longer lever arm means more leverage.