We never got into much grass, all the fields were pretty clean this year the sprays must have done their job, the stems were actually larger due to the low population that they planted. In the pictures you are correct there are 2 different heads, the one on the right was our machine with the 10 row head, the other one was a demo machine with the new 12 row and wider throat that the dealer brought out for us to try, we had a couple of guys from New Holland there that day also and they checked it over and all they could say was that it shouldn't be doing it but they had no answers. We had one NH "forage specialist" go as far as to tell us that he thought that plugging once and hour was acceptable. As far as the 12 row went it didn't seem much better as it plugged up 3 times I think just while they were there - same issue - it got to the center and just stopped.
As far as the chopper goes we were pretty happy but the head problem kind of jaded us so when some other minor problems emerged they seemed worse than they really were, bottom line was that it ran all year without any major problems except the KP - one of the grease lines broke and a bearing went out - they brought another one out and had it switched in a couple of hours, that's the longest we were down. We were able to get to almost all of our customers on time but we did lose a couple of jobs because of the time lost with the head and having to drive slower than what the machine was capable of - most of the 15 ton acres were run in economy mode because we were not able to use all the power anyway - sorry this got so long just wanted to make sure you had all the important info. Definitely more efficient with one big machine VS. two smaller ones, don't regret that move one bit.