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I am glad you got guiding to work, i haven't read through all the comments so this might have been brought up before. you mentions that by the time you got the guiding working the framing was out, this suggests to me that polar alignment wasn't that great. if that is the case, the guider has to work harder to get perfect stars and it may cause eggs, also, guiding wont stop any field rotation brought in by bad polar alignment. The other thing is differential flexure, with your ED 80, just make sure the connection is absolutely secure. Wherever there is a connection, the possibility of movement is introduced. also you want to make sure that you are guiding with the movement of the OTA, so that means if you are attached to the rings, they need to be solid to the OTA itself. sometimes you can be guiding perfectly to the rings but the rings might not perfectly follow the movement in the OTA itself.
a good way to determine what the problem is is to look at the PHD graph. if it pushes in a single direction predominately then it is likely a PA issue. if you get big spikes from time to time then there is some movement in the system.
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