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I've used a 550d and a 40d before - this is a 60d. I think it has the same size chip and overall configuration (distance from adapter screw to sensor)?
M17 was almost overhead so not likely to be camera tilt. The other images were lower and did not have this coma. The overall fit of the 60d in the adapter is probably a bit better than the other cameras.
When I focused for the second image and used the bahtinov mask I noticed that the center spike had moved a fair bit off center - that's why I think the heating of the corrector plate has affected the focus.
I have had mirror flop once a few years ago and it didn't cause any coma, it just caused the image to shift and only affected the focus slightly. I have never seen coma in my f/10 images ever - so it has to be something a lot different to what I usually do. The next 3 images (same night with the 60d) were okay - so it's not the set up etc. I will test this next image I take by deliberately taking some subs out of focus.
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