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A wonderful wide and colourful field. A lot of tight small stars there so not sure what the fat FWHM you are referring to is here.
The top right corner stars look a hair out of focus compared to the other 3 corners so a very small amount of tilt.
Also with these scopes, focus will shift despite carbon fibre once the mirror achieves the same temperature +/- .5C. So if you focus when you start and the mirror hasn't achieved equilibrium then you will need to refocus once it does. In my case that takes about an hour.
I also use temperature compensation in case focus shifts with temperature drops. That may not be so critical with a carbon fibre scope but the first is.
Greg.
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