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As far as the movement of the laser dot when you move the tube from horizontal to vertical and past, have you checked that the laser is not moving in the drawtube. May only be .01mm slop in the fitting but that can account for the dot moving if the collimator is not clamped firmly.
The machining tolerences of mass produced astro goodies sometimes leaves a bit to be desired. The laser collimators I've got , admittedly cheapish ones, have a sloppy fit in my newt focusers and I shimmed the barrels with some tape to make a firmer fit with less play. Might be worth investigating.
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