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Hi Dunk, I can suggest one thing else to check out. You maybe spot on with your static collimation, but collimation can shift in differernt sky orientations likely due to primary movement. GSO newts, Dobs, are well known for having weak primary springs, and this can affect other brands as well. It is pretty easy to test, do your static collimation on your mount, then pick a range of various star targets at different altitudes to the east and west, checking the collimation by defocusing each star, if your springs are weak you will see definite shift. The fix is pretty easy and available at any Bunnings store, replacement springs. Remove one of your primary springs and go along to the Cabinet parts aisle at Bunnings, find the display where the little yellow labelled spring packs are hanging. Find one suitable size, but with greater compression strength than your stock springs. Don't worry if they are not exactly the right length, in fact slightly longer is better, and even if too long you can cut them down. I have done this mod to every newt and Dob that I have owned in Australia.
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