No, what I mean is that the rotation controls are not proper tank controls. For tank controls, moving forward while turning right moves you clockwise. Moving backwards while turning right moves you counterclockwise. In this game, both are clockwise, so you end up moving in a figure-8.
I think the issue you are facing is that you are not wanting tank controls, but
car controls.
Driving a car using WASD in a game: You are holding D. Your car will go forwards and to the right when you push W, and backwards and to the right when you push S, which is what you want.
A car handles like this, because you are adjusting the wheels when you "turn" with A/D, but this is not how spaceships work, with a spaceship you are actively turning the ship itself with A/D, and this has no influence on the thrust that is used to go forwards/backwards.