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I think I may have found the issue. Thanks to Chuck over on Stark's, he suggested that I check the belt system, making sure it was tight. There may have been some slippage causing the large jumps in DEC. Sure enough, there was a little slack so I tightened it up. It seems to have helped as movement wasn't as large after a few test runs. The graphs were much more stable and the RMS value was around 0.41 which is fairly good given that I'm guiding with an image scale of 1.44 arcsecs/pixel. I will try again tonight to see if it was just "pot luck." Silly me, as this is probably something I should have looked at earlier.
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