Not sure about this but I would have expected the stud/nuts NOT to be 'stretch' like the bolts, so procedure and torque settings may well differ. My Cometic gasket set certainly had no mention of any procedure changes.

I've added 60 degrees to my bolts at stone cold. The oil seep has stopped - wondering now if it may have been there from before I torqued the head down at all.

I take Stu's point about the 'proper' way forward - I'll continue to monitor and budget for a new gasket and bolts if things go wrong!