was the spacing of your piston at TDC the same as that in my picture? mine is only on there with a paper thin gasket and light sealer. I can't imagine that getting 180 psi. although I haven't tried it yet, so I wouldn't really know. haha
I was thinking of milling the cylinder so the dome of the piston crests a bit out of the jug and then using a tomos head since it has a small squish band and has fins aligned for angled placement