Hmm..., no one seem to be answering your question!

I don't have strong expertise with your problem, but if it is creaking, something must be moving, even if just a little. I'd keep sailing it, and see if it stays the same or slowly gets worse. Keep asking the question of other sailors as opportunity allows in the meantime. I have seen the inside of Hobie 16 hulls. If the pylon attachment has a problem you will have to open up the hull to fix it. So if it is a minor annoyance that doesn't get worse, I'd live with it.