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Thanks bojan, but I'm very confident its not balance. I'm much more convinced its something either to do with worm or possibly settings in Phd. I turned of the dec adjustments for a while and the graph flat lined, no drift or movement evident. Not a bump apart from normal seeing fluctuation. When I turned it back on it started again. I check my phd settings and found that at some point I'd adjusted my min dec movement to 201.
I noticed the problem earlier in the week, when the graph started doing smaller jumps. It would move one way, settle back and then move the other way. (See graph.) The min Dec move was set to 150. Increasing it made it worse it seems. But it still doesn't explain the initial movement. I suppose the only way to check is to slew to -69 dec and then loosen the worm slightly and see if the problem disappears. Certainly having the higher min dec movement made the problem much worse.
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