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well sounds like it's your focuser throwing the collimation out. It can be skewed slightly, as long as it doesn't move after you star test/collimate. But if it's moving around then you're going to have problems.
I currently use a cheap rack and pinion style and had similar problems until pulling it apart, lining the tube with new teflon lining, for a snug fit, and then carefully tightened the 2 allen screws and the main nob until the laser was steady.
Until I got the laser I had no idea just how much the focuser was moving around and throwing off the collimation by just focusing. It looked steady as to the naked eye, that was for sure.
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