Fixing uneven fields does not sound like a job for any disk.   I thought they were primarily designed to create uneven fields. 

 The tilloll would do the job, but it still has a little of the disk in it....they sometimes tend to ridge a little.  

I'd go for a good high residue field cultivator and try to run behind the beans.  Field cultivators, especially long, drawn-out ones, are about as effective as anything short of a land plane at getting rid of uneveness.   A chisel plow would also stand a good chance of handling the residue, and you don't have to run them deep.     Whatever you choose, you want a good harrow on it. 

We plant notill beans behind corn every year and usually plant a different direction...there's really no reason that tillage is required to change direction.