I don't understand why you want to bend it ? I don't bend the tube at all. The tube in the boat is in straight line with the motor shaft. And the tube part that exits the hull is also straight. The wire will bend good enough outside of the tube. There is no need to use a very long tube. If the tube exits the hull for about 3" it's good.

I see , you probably mounted the motor horizontally right ? You should mount the motor facing down in a straight line with the bras prop tube. This causes no drag whatsoever. The prop turns like a Swiss watch.