Have the Flight Controlers regulated or controled ESC's input and output voltage?

Hii Guys
I asked this quetion Because, I setup Octoquad with U8 85 KW motor Alpha 80 A HV esc. and 12S Battery . while setup the aiecraft I hadn t HV power module in my workshop in this point I setup with 6S power module so I would have seen only Semi voltage while flying on the HUD scren althoug motor should be driven with 12S … While the first flight tests everything was seems normal but I couldn t get enough power While the test bench resault all motors should be trust almost 30~35 kg aprx… aircraft take off weight 18 kg during the first attempt, if you request I can share you log file, test vide, battery coonection diagram… also it mght be test bench resault…

Best wishes…