That's right in line with GL 40 specs of max of 6.9kts electic, consuming about 8.5kW each motor in your case - which are 10kW max, I believe. My '14 GL 33's elect. motor with the VW 165 HP diesel is rated 7 kW, and I get about 5kts max in still water, drawing ~120A-6kW..
No way a 40 is going...