From the photo you provided I think the focusor is raked out a little too far and that might be causing the DAF adjustment in the model. I would also consider the connection with the camera itself.
The rest of the model is looking pretty good. I would lower the PA by the required amount. try doing 21 points at a time on the polar alignment and use a very small area of the sky, preferrably a small constellation out to the east. Do the adjustments each time and do this 3 times or until you are really happy with the polar alignment. Then do your full sky model. You should be able to get down to 15" at least for pointing with a 100-250 point model.
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