Thanks all for your responses. I am still testing GPG and guiding. Had some clear night's. Away for a week but will report on progress later.
What I see is guiding is pretty good but not good after a meridian flip.?

The number of stars reported for guider in analyse increased by 50% after the flip. The guider isn't aligned with main scope but isn't too far out the target being on the edge of the frame. Struggling to work that out but can only assume the area of sky seen is different after flip?
My 60mm guider with asi 120 mini for a 12"at f8 may not be good enough so considering a OAG with a better guide camera.
I would like to investigate backlash as star images are elongated in RA when poor. I have looked at the internal guide log with PHD2 viewer but can't see any measured backlash stats. Does anybody know how to analyse the calibration? Ekos just reports successful but it would be good to judge how successful? If I do adjust the worm position I would like some stats to measure if improvements have been made.
One irritation with Ekos guider options GUI is the use of the mouse scroll wheel. When a window isctoo large to display I normallycusecthe mouse wheel to move upland downvthe window. With the guider options if the mouse happens to be over an input control the mouse wheel changes its value which I find can happen by accident when really wanting to scroll the window. The normal set up is for user to have to click into the input control before adjusting it. Could this be fixed? One day I will set up a system to help out with coding!
As Hy says its a hobby with software developed on a voluntary basis so must be patient and swap notes.

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