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PHD and Orion Starshoot - not a good combination.
Well I reverted to Maxim last night in light of the advice from Rich and others.
Maxim puts the OSS into 2x2 binning mode effectively turning it into a mono camera with higher sensitivity and lower resolution - but and here is the good bit sub pixel guiding works.
The results were a revelation - well to me anyway - 20x10 min shots with only 2 fails...much rounder stars in all the subs in fact acceptable at 100% res.
I have also established that guiding at .5x siderial gives a better result - which means a move from the ASCOM/TCPIP setup to ST4 and a GPINT...which means moving the shutter cable from parallel to USB which means...more wires,,, (thanks Hap!)
Still as Morris would say I am heading in the right direction!
Lesson - One shot colour cams do not make good guidecams and sub pixel centroiding claims may not be all you hope for with some of the software/camera combos out there, if in doubt do the little test and then you will know - I certainly was not aware that this was my problem and went down many rabbit holes.
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