a 10:1 cr motor wants to be pulling 12 - 13 bar under crancking really 180 - 200 psi is what it idealy should be
as th emotors been stood for ages, and seems to be getting better hopefully you should find the compression will come up
But for the purest engine experience, displacement has no replacement. All other methods are simply attempts to artificially recreate the benefits of displacement.
Hope you get this sorted, defo a cool build