Actually your cooling inlet may be a bit long. Cut it so it's flush with the bottom of the hull, so that the bottom of your hull is smooth with nothing protruding from it. You want your cooling tube so it's going into the hole in your hull's bottom at an angle toward the front of the hull. You can even put a bend in it so it's pointed towards your motor.

I don't know if that makes sense or not to anyone but me, but if not here's a diagram of what I'm trying to say!

Hope this helps.