compression test on 95 cr 125

hi guys quick question,just got my cylinder back from langcourt for a renickasil and hone sent oem piston along with cylinder.cked my ring end gap at .57mm at bottom of cylinder spec is .40 to .55 mm with a service limit of .65mm. so i decided to assemble any here is my question i did a compression test after ass, and got 90 psi with a known good gauge.i did not have top covers secured for the hpp valves,can i be losing compression through those covers? i am waiting for new bolts to show in the mail.reason they are not tight

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