in this area and I think many others also, EVERYBODY incorporated their chemicals. Now the chem companies want you to pre or post without the tillage. My theary is we aren't getting the chemicals quite deep enough for alot of the weeds. I realize that you can go to deep, but giant rag and several others can germinate  3-4 inches(or more) below surface and I dont think we are getting these. JMO. As far as a good corn pre for incorporation, Bicep, which has several similar cousins in name brand and generic. Not much on woolycup tho.