20s for the Demon - how low can I go? (big wheel haters don't look)

I bolted my wheel to my axle housing with a tire on it and set the car down onto the tires. The tubs stopped the frame right before it hit the factory bump stop. I then rasied the car 3" and thats where I ended up. 285/40/20 in the pictures I posted. a 325 is WAY to wide and almost 6" wider then a stock tire.