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@clubman
Here's a repeat of my post from 'Seat pin slot pinching' 22 days ago.
If you don't want to bother with Clive's solution, you might try simply removing some material from the sides of the slot with a file or a hacksaw.
Hot Melt Glue
Here is a radical but simple solution to the seat post problem - forget the clamp, just use hot melt glue.
Clive Bonavia (google him) was an eccentric but excellent frame builder who used this method on all his later frames. He said it had three benefits: it saved him the trouble of making any kind of clamp, it saved the weight of the clamp and, most importantly, it prevented any water getting into the frame past the clamp (a common problem, causing corrosion).
Clive's main business was joinery, so he knew all about glue. Although I think this material was intended for wood, it seems to work perfectly for this purpose. It can be reheated any number of times to adjust the seat post, and the amount of heat required to free the glue does not damage the paint.
You should be aware that I'm just quoting Clive here, I'm not writing from personal experience, but in my experience he was always right about these technical matters.
So I suggest you google 'hot melt glue', and don't forget to clean and degrease everything before assembly!