Well, I broke out the belt sander and went to town on the top frame - it's now perfectly smooth, flat, and most importantly.. it's perfectly level! (I didn't sand it down to be level, it just happened that I did everthing right)
I really surpised myself. I took my time and did everything right, went to Homies and got some of the highest grade kiln dried 2x4's they had, and it seems to have paid off.
Of course my wallet is now $200 lighter, but it was a **** productive day.
Here's a picture, sorry for the grainyness of the darker areas, I had to lighten them up in photoshop.
Again, thank you so much for all the help.