you buried them.. Thats the sh*ts with a hoe drill, if you don't see a shovel come out every now and again pull it up some. As far as your car tracks, what are your openers? I have a Flexi-coil, pretty much the same drill, it had 5" openers on it, put 3/4" on the main section. That seemed to help, but I think I need to pull the shanks up were the cart runs. Anther thing, at 5.5 mph thats moving for a hoe drill, the guy that helped me get started farm use to pound into my head, with a hoe drill in shallow crops no more than 4 mph, thats why they make 60ft+..
Don't give up on them though, last year I did the same thing with my Flexi, it was dry and I was doing the ugly no no of chasing moisture, they did finally all come up, and I had a very nice crop.. Just was sickening to drive by, spray, talk to the neighbor..