Ok just an update, these things naw at me until I figure them out so back in the garage to figure it out, and I did (whoopee).
The result
My compression tester had a bad seal where the adapters connect so it was leaking like a good un. Also it reads 10psi less than it should (checked against 3 other gauges).
So sorted this out and ran the compression test again and the result was 170psi as near as dam it across all four cylinders so Now Im a happy Bunny.
Still going to buy a leakdown tester just for keeps and practice.
Thanks again for the advice