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well, I set RA to 0.5 but have never set the DEC guiding rate, I would guess 0.5 for DEC too. Whats more of a worry is the big leap to minus. This looks like backlash, have you adjusted the worm gear closer to the DEC gear?, is the DEC axis balanced biased a bit?, is there a backlash setting in the controller?. I dont think a lower "agressiveness" setting would help, since its guiding one way anyway. If DEC cant take guiding both ways, theres a serious backlash or other mechanical problem that you need to sort 1st. If that graph is scaled in arcsecs, thats pretty good anyway.
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