Hi
I do not change set in Game , but Max Power is only 65%,can not gain higher

I press P key to have 65% Max Power.
If i do not press P key,i change Power by mouse wheel only. Strange, in control set,keyboard Map,whatever i configure Max Power,it does not work. I mean,in game,only mouse wheel can change Power/Engine,besides that,Max Power is only 65%.
So by far,i did not shoot any enemy down

Help me
Thanks