Kurt, I am not aware that the cometics require a difference torquing procedure.

However, iirc, the 180 degree turn must be done without checking for torque.
So it's likely your head isn't clamped on tightly enough, hence the leak.

I don't know if it's ok to tighten it up, or, if you need to start from scratch now with a new gasket and bolts thoug.

The problem will be that unless you remember exactly how many degrees you turned each bolt before stopping, you won't ever be sure you did them all up correctly and not under/over tightened