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I agree, tracking issues are all that are really visible in the shots, which is unfortunate but fixable.
I have just revisited the shots of the scope on the mount, and even without anything in the focuser, the scope appears to be as aft on the dovetail as possible, so a set of OTA rings (as I suggested) probably won't be of any use.
If I were doing this I think the only fix is to have a dovetail rail extend out underneath the focuser, and in my case it is a Losmandy D sized rail. Your option of adding weight underneath and to the front is worth looking at, as much as I hate adding weight. It seems the only real quick fix. Make up a clip on weight that you can slide right to the front, something like a lead weight, or some speaker magnets and try it.
Gary
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