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Hi Brett,
Over the last few months I have gone through a learning process with PHD and an 80mm short focus refractor - I have now switched to an OAG because I shoot at 1600mm f.l.
The key that I found with using a short refractor is to get the min motion as low as you can - had mine to 0.05. The default on PHD is 0.25 I think. However, as I was shooting at 1600mm, this still was not good enough. It will depend on the quality of your mount and how well you are polar aligned I would say.
You should be getting an RMS below 0.2 at least or way better.
The bottom line is if you are getting nice round stars. Is this happening for you? How long are your exposures?
I have also found that sometimes PHD goes "off it's rocker" so to speak - I think this can depend on the Dec guide parameters you set (e.g. resist switching; North, or South) and also sometimes the quality of the guide star.
I have not switched to PHD2 yet.
Hope this helps for you and good luck.
John K.
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