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Thanks for the details. My thoughts, for what they're worth. Very few
imagers routinely venture above 6400 ISO, [especially in summer, when
high ambient temps. make the images very noisy]. Many imagers stick
around 800-1600. In very low ambient temps. you can go higher.
I'm curious as to why you used the vastly different exposures and ISOs,
unless you were just experimenting.
A good first step is to take exposures close to 0* Declination [ Orion's
belt, for example], and at high Declination [ Crux, for example], and see how long your exposures in those two places can be before the stars in your images start to elongate.
raymo
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