RE: how much pinch at TDC does your engine have
ARO = After Run Oil
ARO is a must after weekly used.
if you didn't use any ARO to your engine, and about to ran 1 gallon or more then you're in way out.
compare it with other engine compresion.
if you think it still perform great and why you ask about compresion. that thing will kill you. just enjoy it and take care of your engine