Okay, after reviewing the result, doing some reading and getting feedback from Gino in Italy on the above, some minor tweaking of collimation is required to achieve optimal performance. Now, could the person who caused the clouds and showers to roll in please step forward!
In other news, while the native, uncorrected optics are F8, I found out that the flattener used causes an increase in focal length to F8.7! I discovered that while doing my first plate solves & TPoint run (0.59 instead of 0.64 arcseconds/pixel image scale) and this has now been confirmed by Gino. This is more good than bad news for me since I'm after
narrow field views!!!