You said in your first post that the previous owner had a shop replace the HG, so that means they torqued the bolts to 58ft/lbs. Even if they did use new dealer head bolts, at 58ft/lbs they will stretch. Because it happened so soon after the first gasket was replaced I'd bet they reused the head bolts. That head gasket didn't blow, it was undertorqued and allowed coolant to flow over/under the gasket. Thats why you can't find the defect in it. It happens to 99% of MK3 supras, head gasket didn't blow out, the head bolts were stretched and allowed coolant to flow over/under it. The other 1% have the actually blown out gasket.
By the way I love your avatar.
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