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No need to over complicate single bevel honing with math or ratios. Wood workers who hone their chisels will understand this easily.
Honing on the back (Ura) is simply to remove any small burr...

Oh wow ! you can never put that metal back :cry:

The razor was worn or you used too much pressure & judging by the wear pattern the razor may be warped. Hard to tell from pics.

Just a fyi . ...