to which ground are you measuring the 8V? the controller ground is different than the gate ground (assuming you're using different 12V batteries to power the controller and connect to B+, B- bus bars... which you should use 2 batteries, even though I think it'll still work otherwise).
the gate pins would be referenced to the output ground which is the B- bus bar. Yes, this should be a constant 12V if the FETs are wide open.
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