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I wouldn't use the DEC slope weight unless I had real expertise in PHD tuning - go auto instead.
So far no one I know in the PHD forums have achieved better results going manual over auto and tuning the DEC slope (up increases sensitivy, down lowers it.
If you think you are pushing guding past the seeing and over correcting your mount either raise minimum pixels drift before a pulse guide is issued (to the equivalent pixels / seeing to 1 -> 2 arc seconds) and / or lower your dec duration to limit your correction.
If you are yo-yo'ing - chasing the seeing - in RA raise the minimum distance before pulse guide is sent - raise the RA Hystersis and lower the RA aggressinve 10%. In DEC again raise minim distance and lower DEC pulse guides.
PS
Why isn't this in the Software part of the furoms?
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