I have to agree with Stuart after his presentation of the stretched files. That looks to me like PE whilst slewing.
Where the line ends looks like its a star, all the other white pixels look like noise.
How fast do meteors travel? Their trajectory must be such that they leave vectors. I can understand spirally trails left behind in gaseous vapour, but, this doesn't appear to be the case in this image.
There's a new case for not using ICNR and taking your own darks.
Nothing ventured, nothing gained.
Regards,
Humayun