Need help with Panel Beating

Ok, first off I'm new to doing metalwork, and after getting the car back from the sandblasters the roof had a very bad oil canning, I was able to shrink the area with the torch/hammer and dolly, but now the surface has some high and low spots and before I proceed I was wanting to get some feedback on what I should do. I was thinking to use a serrated shrinking hammer with hammer off the dolly technique. What do you guys suggest? It's going to be covered up by the vinyl top so it doesn't have to be perfect just close for Bondo.

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