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If I just can't get it to go, the backup plan is to snip out the corners and do the compound curvature with foam/fiberglass.
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That would be a shame considering how you've done so far. I suggest cutting 'darts' in the aluminum. To save me drawing or hotlinking a picture, look at the Goode Homolosine and Waterman Butterfly map projections
here.
If you use the Goode Homolosine, the single seam could be lapped, or trapped in an aluminum or brass H-channel (model making parts).
A person who's better than me with a hammer and dolly could make that corner flat again. Maybe that's why the planishing didn't work, it wasn't pre-smoothed enough. You could try shrinking with a hair dryer and dry ice, if the aluminum wouldn't lose its temper.