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Wow, that is quite a story.
Sorry to hear your troubles.
I remember on the TEC forum where Yuri measured flex on the Feathertouch 3.5 inch focuser and it was less when the focuser was upside down, ie. the focus knobs are on the higher side.
So I used to image with it in that position. I don't think it made a lot of difference but it was measurable.
I imagine a 7.5kg and long imaging train is outside the specs for the scope.
I got a perfectly flat field with the flattener, adapters, MMOAG and FLI Proline 16803 (quite heavy). That was probably 4.5kg perhaps a tad more.
Greg.
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