My Right rear wheel rubbing...

I recently replaces the shocks in my 72 Swinger with KYB Gas adjust. When I bought he Car had Air shocks on the rear complete with bike pump nozzle. They still held air but were super soft and bouncy...awful. After I replaced them the car sat a bit lower but the right wheel would rub on the inside fender well. We rolled the fender out a tad old school with a baseball bat and that stopped the rub but when i hit a dip or a good bounce the wheel rubs a quick hit.
I think the culprit is the 15 inch back wheels. They have 205 65 r15s.
Are these just too wide? I really like the wheels. they are 70's vintage centerlines and look GREAT!. can I put a more narrow tire on the 15's or is this a shock and leaf spring issue?
your thoughts and ideas are appreciated
Cheers!