if you "loose compression" when bike is hot, sounds to me like valve lash set too tight.
in the name of science, would try to set the lash bigger than spec and see if it brings back compression also when warm,
go for 0.25mm both in and ex just to test if it makes a difference, leave decompressor off to make sure its not interfering, report test result...
you didnt say how many miles on that bike, valve guide/seat wear might be an issue.....
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