Thanks Martin, I'll try that also.
Perhaps I'm overthinking it, just pick a sub that has the framing I'm looking for, and let stacking do its best trying to provide an even looking final image, without a noticeable degradation or darkening of the corners (that were rotated and therefore have less data to work with).
I'm trying not to crop actually, as i have the framing im after, im just looking for the best way to fully keep that whilst also making use of some rotated frames in the stack.
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