You're gonna hate me for this I'm sure, but more lube might actually *be* your answer - although position and entry angle play major parts and might be the real cause regardless.
I'm also pretty large (length7.25", circ6.5"), and a few months after my gf and I began having sex (a few years ago) she began experiencing some burning pain on the outer (and some "stabbing" pain on the inner one and inside the) left lips of her vulva every time we had sex - and that pain usually went away after a couple of minutes just like yours seems to be doing.
We found that either using lots of lube in some positions (and I mean *lots*, like a tablespoon or more) or doing it in positions that had me entering her much more from the right side than the left solved the problem entirely, and that pain hasn't recurred in almost 4 years.
Worth a try: lube's cheap as dirt, and changing your aim doesn't cost a thing. ;-)
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