Dale,
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This seems bizarre behavior. Dec (which should be in red) typically will drift in one direction if PA is off. If seeing is bad it should vary randomly. Having a repeating pattern I think is something software other than hardware as the Dec motor should only be rotating back and forth as corrections are needed.
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Some random ideas:
-Are RA and Dec cables reversed (probably not)?
-Are you dithering after every frame and is the dither large?
-Have you checked TVC in the hand controller, perhaps too large a value?
-Dec MinMo seems large - I'm seeing changing values from 0.2 to 0.35
-57# on an GM811 seems, like a lot. If a G11 has 60# payload, the 811 is less, I think. Are your counterweights all at the bottom of the CW shaft? Perhaps too much moment-arm the mount can't handle.
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All I could think of for now.
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Good luck.
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John
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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, NINA, Sequence Generator Pro and PixInsight user
