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Digging up an old thread here.
Notes from me:
Aero. As well as the slamming Aerohead explained, the tapering fins may be working like a funnel. This tries to force the air from top of the window width down to a narrower gap creating drag or forcing the air up over the sides. Neither is good.
Reinforcing. It seems you terminate the rods/flat bar/plywood at the inside of the fins. This creates a moment connection that will flex considerably due to the forces on it. Instead try an aluminum flat bar, but bend the ends and attach there to the fins. This will transfer the flex from a moment connection to pure tension force on the sides.
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