If you have a box blade with scarifiers, I would look at dropping the scarifiers and running them as a ripper a few times. Then you could smooth it out with the box and/or a drag. I think I'll be doing that this fall but need to get the soil sample done first.If there's a lot of weeds/grass a disk takes a lot of passes to make ground suitable to plant. A moldboard plow or a field cultivator/chisel plow with 2-3 rows of sweeps works better. I'd also suggest spraying the areas you want plots with RoundUp or a similar generic a week or two before you plan to till up the plots.
Just had this discussion on another forum.