looking at the first pic, shrinking or stretching that flange will only make the flange go in or out, not up or down. down is what you are seeking.
when you block out shape on a sand bag, the metal stretches but it pulls from all around it. if you hammer on a hard surface (dolly) the metal stretches where you hit it, it doesn't pull material from all around the strike point.
my guess is you have tipped the flange and then blocked out more shape? that has then lifted the flange where it doesn't meet the flat surface you have it sat on.
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Neil
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