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Hi Mick,
I check mine (same scope as yours) every time I go to use it, and its always the secondary that needs adjusting but only about 1mm (from the inner edge of the white ring to the centre).
If yours is moving 2 -3 cm make sure the secondary screws are tight and also check that the spider vanes are tight as well.
Also rotate the laser in the focuser draw in case it is causing the wide discrepancy, this is probably the main cause of your problem. The lasers do need collimating by sitting them in a V block and pointing at a wall and minimise the circle it draws while rotating the laser.
Bill
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