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@jammy
Thats a strange one. Sounds like the inside bore of the seat collar could be sloped/tapered which means it'll work it's way up as your tighten. I really doubt the seat tube itself is tapered. Try getting your hands on a new collar, something good quality
Absolutely normal to lose paint at the collar though I'm sorry to say. When I was at Saffron we'd slip-braze a stainless steel ring to the top of the seat tube to be left unpainted which the seat collar could grab onto for this very reason....