Quite simply, you won't know until you get the head off the block and look. A bad HG is still just as likely. It is possible that you are burning coolant and it is also possible that the hole is small enough that combustion gasses are getting pressed through but there's too much resistance for coolant to come through at this point. The reduced pressure as the car warms up is only indicative of a small leak and that as the head, block and HG expand from heat the leak that is being pressed closed enough seal sufficiently.
At this point don't worry about it, it's pointless and it's distracting.
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