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Thanks for your input Greg and Ken,
The RA worm cycle is about 8 minutes. My exposures were 30 secs with a 4 sec delay. The jump occurred about every 9 images = 5.1 minutes so it doesn't quite relate to a factor of the worm cycle.
It might be clear tonight or tomorrow night and the moon is still bright so it's a good time to experiment with different settings to try to solve this issue and maybe try different RA settings to improve my guiding.
If I could get 2-3 minute subs with round stars I'd be happy - lately I can barely get 30 sec subs with round stars even with guiding.
Tony.
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