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I especially like this if the 60% multiplier becomes 60%² at N+2, 60%³ at N+3, and so on. Feels like you're getting rewarded for hopping on early.

Too complicated. I charge the same for v5 -> v7 and v6 -> v7.

Well, I like it anyway.

You mentioned you have been developing Indie products since 2005 in your about section. Can I read about this somewhere?

Pretty much the entire https://www.successfulsoftware.net blog is about that. Maybe start with:

Didn't realise you were OP!