That was my issue in the end as well, the position of the guide tube was not ideal, I changed it from the finder shoe to under the dovetail and this gave me the best results confirmed by PHD2 guiding assistant.

Still minor variation between consecutive runs as well, in the few arc minutes though (<5) and mostly on the RA axe, I think that is due to other factors that probably change from one run to another like wind, flexures, gear meshing, etc.

In any case this is now totally usable and will finally take me away from the looong PHD2 drift alignment method I was using until now.

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