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That turned out well Kevin. The elongated stars at the top left and right are consistent with some tilt.
If you are looking at your camera standing behind it the corners to pack out will be the bottom left and the bottom right. it would be a matter of .4mm or less. I got some brass shim from a metal supplier. My filter wheel is a mess of blue tape and taped packers to correct for different scopes!
It looks like the bottom left needs to be packed out a bit more than the bottom left looking at your camera from standing behind it.
Are you using an eyepiece holder to mount your DSLR or a solid screw type adapter? The tilt is likely in the eyepiece holder if that is what you are using.
If you correct for tilt and can't get it any better it may need a touch of collimation.
Greg.
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