I run the coulters a lot deeper. With the double disking, you have soft dirt, and need the coulters to hit hard dirt.
I try to plow unmolested corn stalks. Works pretty good 4 out of 5 years. I combine in the same direction as my wife will plow. Takes a little planning.
Some years a disking makes things worse. Time of day affects it also, dew, etc. Freezing affects it - works when it's not frozen, works great when frozen, won't work at all as it's freezing.
I'd put the coulters lower into the ground - mine end up about to the hub. See if that helps.