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It looks too good to be true. Can you post the guide log? I suspect you are guiding on a hot pixel.
Why? The profile shows FWHM of 1.01 (i.e almost exactly one pixel), it has a peak value of 255 yet the star is not saturated, the guide RMS is close to 0.1 which is the limit of guiding precision, you have an exposure time of 1.5s so you would expect to see more movement from seeing, and there is a continuous stream of dec pulses.
It could be something else but it looks, walks and quacks like a hot pixel.
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