210° @ Cruise and 180° @ Stop? What's Going On?

Between the hood and the fan and shroud setup you could have an aerodynamic issue affecting the flow you need. If there are large closed off sections outside of the fans you should cut out some rectangles or fairly large areas that you can put flaps on. They will suck shut at idle and blow open at speed. The rubber is a flattened V that attaches to the bottom of the hood right above the core support so it fills out and closes the gap at speed. A chin spoiler may also help.