Head gasket failure/replacement
So I suspected a head gasket leak, short drive and pulling the plugs show coolant in every cylinder. Engine has 1640 miles on it, with the first 1300 being on 8psi and the rest at 15psi. Block was said to be straight by the machine shop and the head I didn't check since it was brand new from DCR. I used a stock replacement felpro MLS head gasket dry without any of those copper sprays. The only explanation I have for this is that the head studs came loose, which would explain the coolant in every cylinder.
I know there are plently of people running 400+ on the stock head gasket. So what is the standard for head gasket replacement for someone looking to make 500+? Should I go with the same gasket and one of those sprays or something different? The only other gasket I know of is DCR's 5 layer and cometic's MLS.
Looking for reccomendations to keep this from happening again.