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My blue vs your blue
I really appreciated your posting of your raw blue frame. It enabled me to make a direct comparison with your camera. Granted the seeing may have been better at your end but I believe your final blue tiff image generated from the blue frame after stacking and optimizing may not differ a lot from mine. Note the larger amount of noise in your frame vs my frame. Your frame is somewhat sharper. A blue frame from the same night at 7.5 fps is shown for comparison. I should mention that I am capturing at 12 bits.
Overall you don't cringe from noise because you feel that stacking will reduce it sufficiently to make it irrelevant in the end. My Astro IIDC camera can be set for stretching that will make the captured image look very similar to yours in overall noise but I have an aversion to that much grainy noise and go for the dimmer, non stretched capture every time. In the end we seem to arrive at the same place in S/N land.
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