Your keel job really doesn't look that bad. Not sure how much of the bad stuff you removed before painting it, you need to get down to good metal. Also, Im not sure what kind of paint
you used to paint
the keel. That is really the basics of refurbishing a keel.
Its not really something you have to pay to have done.
Not exactly sure about the "clunk" you hear, but the problem is probably right around the pivot pin. It could be anumber of things in this area.
1) The fiberglass structure that the pivot pin is mounted in could be weak and allowing it to flex from side to side.
2)The keel could be "wallered" out as we say it. Meaning where the pin goes through keel, could be worn and the hole could be larger than it should be allowing it to swing on the pin.
Basically you are going to have to remove the keel to get to the bottom of this. Once you do that, you can figure out what the problem is.
Although, if you are going sailing soon, while you tack and the boat heels over have someone watch the spot where the pivot pin is. (If it is visible of course)