My notill coulters are the straight edge bubble type blade that normally only cuts a slit through your trash. I have them set shallower the original Yetter bracket would allow. I had to drill a extra hole in the adjustment. I will need to look today and see if they might be causing any problem and probably go ahead and take one blade off and compare to the other rows. The one row I had the spiked pinch wheels on yesterday looked pretty good.