Oops, now I see you went into detail on the fittings already. I don't think you're supposed to use worm gear clamps on PEX. Perhaps spring band clamps https://www.amazon.com/dp/B077YDHSFB Fuel injection hose clamps https://www.amazon.com/dp/B07HJ3S28L Or t-bolt clamps would provide even pressure all around the fitting. https://www.amazon.com/dp/B00QQYWO0S
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