Welcome William. Sometimes it helps to do a good search of the old threads since this is ground we have covered many times now. Here's a link to the old forum which has some very valuable info for you.
http://www.vikingsword.com/ubb/Forum1/HTML/000717.html
As for the wobble, you probably just need to wrap a little extra material around the tang (pesi) to tighten up the fit. You are going to need to remove the hilt anyway to clean your blade, so just twist it carefully back and forth while pulling it towards you and the handle should easily come off. You should use thin strips of material or thread (some use yarn), but add it slowly and check the fit. It you over do it you could crack the hilt putting it back on.
Did your keris come with a sheath?