In the past for small amounts I've used sand bags believe it or not. To tap the edge back without creasing the edge I used to use a small round flat sand bag. I have a trusty plenishing hammer I've ground over the years to achieve a perfect curve for my stroke. I fabricated aerospace parts for 3 years & worked with various metals of sheet form. I used to finish the arch off by putting the sand bag over the tyre & letting the jack down very gently. It spreads the force into the curvature of the arch but you really need to make sure you don't crease the metal so the shaping of the sandbag needs to apply pressure in the right place.
I'll probably stick some 5 mm spacers on the front & 25mm on the rear. We'll see how it pans out. The car needs painting but I was going to wait until next spring as winter is a bit rough around here. Lol
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