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That PHD graph looks like there is slippage in the RA Tim.
Either the RA guide settings are too low or the scope is too heavy or not balanced so the mount seems to be struggling to "hold" the scope up when it is guiding and then slipping down after it is pushed back by PHD in RA.
Is the Meade 12" ACF too heavy for the mount? Do you have enough counterweights to balance the tube in RA?
I had to buy an extra 5kg counterweight to add to the two that came with my HEQ5Pro to balance the 8" newt tube and camera, guidescope etc, and even then, my mount struggles sometimes when pushing "up the hill" when the tube is east of the mount, no matter how aggressive I make PHD.
Of course, there could also be some issue with polar alignment, you mentioned the polar alignment "routine" but I think you meant the initial star alignment?
I would check that the mount is level, the Altitude is set correctly and that you are pointing fairly close to the SCP, then check your balance in RA and DEC with everything loaded and the clutches loosened (if your mount has these) and then tighten it up and perform the 1-3 star alignment routine if needed. I don't bother aligning anymore as I sync and drive mine through Stellarium Scope so I just fire it up, click on a star and hit GOTO.
I may be off track but I thought it might be worth going and checking the basics before looking deeper into other things?
Cheers
Chris
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