I had 195/45 on 15's with a 40mm drop on the rear
It caused about 5mm of the outside tyre wall to rub on the arch when the suspension was in bump
Rebound obviously moved it away, and being stationary it wasn't touching
I think you'll pull 20mm off
With smaller wheels, and being 5mm thinner
I just think 20mm is too much on the front
My opinion, not fact of course