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For what it's worth Martin, I also run my Imaging train pointing almost at 6 o'clock.i was using the standard 200pds, so guides open and Imaging train were fixed in relation to eachother. I didn't do any maths, but found that i needed to rotate the tube so Imaging gear was at mayb 6.45 and guidescope and cam were at about 4.30... their relative weight and distance from the axis dictated that this gave me perfect balance.
With the Imaging gear up top I need both counterweights at the end of the extension, plus a 2.5kg plate... with them rotated I got rid of the 2.5 and moved the inner counterweight up about an inch, and in my mind this was making it much easier for thr mount to do its thing.
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