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An OAG would sort any kind of flexure problem. If you feel your imaging scope primary may flop a bit or move with temperature then it would be the easy way out.
Otherwise if it is the guider then revise its attachement in relation to the main scope. I could also be as simple as your guiding camera sag into the focuser or the imaging camera sag in the scope focuser.
My gut feeling is your refactor focuser shifts the guider. I had the problem with a barlowed ED80 piggy back on my newt. To verify stick your imaging camera in the refractor and guide through your newt.
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