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Hi Mike. I had similar problems with my 12 inch dob. First thing I did was check the tube ends and make sure they are tight. Next came the spider holding the secondary mirror. Check the focuser/tube fastenings. Next the clips holding the primary mirror in it's cell. The collimation lock screws for the primary mirror are push against a steel plate which does move when you tilt the scope. I glued a piece of 6mm aluminium flat on the steel plate with a shallow 2mm recess using a 6mm drill under the lock screws. I then drilled the end of the lock screws with a 6mm drill just enough to hold a ball bearing. You will now be able to apply more locking force to the steel plate. I also find that you only need to adjust the locking screws when collimating. I hope this might help.
Cheers!
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