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Hi Paul,
can't help with actual settings, but wonder about trying a couple of things.
If you have access to either an off axis guider, or alternatively an SBIG (with the in-built guide chip), maybe that would rule out the differential flexure possibility.
Can you mount the guide-scope on top, rather than side by side. I don't like side by side to be honest, and in your case any weight saving (and I doubt this too) will not be an issue with a beast mount like the EM400.
Gary
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