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Barry
Have you checked the secondary's alignment with the Cheshire? I am assuming it is a combined Cheshire and Sight tube? If not checked make sure the secondary is centred under the focuser and it looks "circular" in sight tube.
The thing to remember is that spending lots of time getting collimation exactly right is often not time well spent. Unless you are imaging it is really hard to tell the difference in the view from a perfectly collimated scope to one requiring a slight tweak. You are usually better of using the scope than spending hours collimating it IMHO.
So if the cheshire look good, that should be OK unless you are unhappy with the views!
With regard to your comment regarding engineering sloppiness, tightening the screws will shift the laser, but you would have tightened them with the Cheshire and also on the eyepieces you use so effect should be the same.
Malcolm
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