I have seen my neighbor with a 6 row poly Case put the header down on the ground and drive across the rows into them almost straight on from the side they are pointing to. Then pickup at the end of the down area spin around and go back for another round. He picked all the good stuff around and had about 4 acres like this, took him two hours and was rather slow. It caused a lot of trash to run thru the combine and had to unload a few piles of stalks off the header. It left hardly anything on the ground except for a mess of uneven stalks, looked pretty rough but yet effective. This is the instance where a 20" or 15" header would really pay off... I feel lucky and have never had to try this, we plant a lot of Garst corn around here and have never had down corn, we are lucky, most of our creek bottom ground is in 25-35 acre plots with drainage ditches with treelines all around to block a lot of damaging winds. Pick your good stuff and go after this last, Good luck