Paul,
whoa, not sure if that is correct. I definitely think your M42 is a ripper. Nice tight stars for a start. This means the guiding is spot on, as is the focus. 7 exposures total is probably as few as I would dare, and maybe the only real thing you can do now is seek out a truly dark site. This will have the benefit of getting round the offending tree as well, although I do have a chainsaw which can help with that.
Keep at it, and start tackling other deep stuff. Above all don't be so modest, they are fantastic. Maybe a good time to revisit some of the old ones, the ones you took at the beginning, and were not overly happy with. Retry them, and see what huge progress has occured.
Gary
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