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Funny, why didn't you stop at para three of your attempts and do what most people would do, a STAR COLLIMATION. Any mechanical device will only get you so close. Your final collimation should always be done on a star with the instrument in question.
Collimation implies mechanical and optical co-alignment. Usually focusers are fine, but sometimes they may not be square to the optical or mechanical axes of your scope. So you need to square it on. This requires removing the secondary mirror and cell.
There is a lot more to collimation than just putting a laser in and hoping it does the job. A laser will not tell you if your secondary is rotated, a Cheshire will.
A good book would be "Perspectives on Collimation" by Vic Menard.
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