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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