rear spoiler

I'm a new Insight owner and noticed the left edge of the spoiler not secure. Since the left clip on it was broken I decided to remove the spoiler so I removed the center nut and right hold down screw and got the left white clip loose. There still seams to be something holding the spoiler down...

Okay, I'm sure I will get bashed for this, but has anyone done any aerodynamic testing with a whaletail on the original Insight? For asthetic reasons and because I park in the sun, I want to mount a solar panel on the back, and would like to integrate it with a rear spoiler. I'm thinking if I...