Two hours total..... that's amazing Peter. Better you than me as I have the attention span of a puppy and lose the ability to guide after about 5 minutes. I had a similar issue to yours and changed scopes, guidescopes rings etc etc and found that the one thing it was NOT was a balance issue. Guide stars were perfectly round according to the guidescope but trailed in the image. It was flexture but after worrying it like a bone all it did was to drive me crazy. I went out and bought a new scope, mount and guide setup and it went away. I suggest Astrophysics and a Paramount might just handle your DSI.
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