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I agree with Greg that T-Point is terrific. However, to be able to use it effectively one needs to be able to move the mount very accurately. What good is a T-Point result that tells you to move your azimuth adjustment 45 arc-sec west unless you have a mount with this level of refinement in the adjusters? However, in saying that, there are ways to confirm the recommendations photographically. It's fairly straightforward to adjust altitude photographically but more complicated for azimuth given that the move is the cosine of the altitude etc etc etc... PEMpro does a nice job and you get essentially no drift around dec=0. But, T-Point proponents argue that all PA is a compromise and that all sorts of things other than drift need to be considered, such as refraction, where imaging, etc.
Please post your further efforts with PEMpro. Personally I don't see how fans would generate that consistent saw tooth pattern seen in many of your graphs. Also, I'd argue that the flat sections are not due to a hot pix. They don't come and go so if it was a hot pix I think the line would always be flat.
Peter
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