Status update: I ended up torquing the keel bolts. They were not incredibly loose but all of them needed tightening, two by a turn or more and the other two by less than a turn. I will know if this removed the keel movement when the boat is next hauled out, although I am also thinking of diving on her to see if I can detect any wiggle that way (I live in BC and the water is pretty cold but manageable for a few minutes with a wet suit - I hope!). I believe that a very small looseness in a narrow keel root would result in a fairly noticeable movement at the tip of a 3 foot keel - even 1/8 inch of movement over 2 inches width would translate into a couple of inches at the tip, if I have that right. So hopefully this was the issue!
I took Drifter for a sail today after rebuilding the mast step and did not notice any flexing or movement in the floors or hull (made pencil marks on the floors and adjacent hull skin and checked on different tacks). I also checked the tabbing under the settees on one side and found it intact, so suspect that the surveyor may have jumped to conclusions when he said the hull had been compromised and that was what was causing the keel movement. Thanks again to everyone for their suggestions. Chris
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