Been trading machines every year so haven't had any feeder problems. We do have to run four lift cylinders and by doing so we are adding more stucture and bracing to the feeder so that helps some. But overall we haven't had any structural problems with the machine's anywhere, just need more cleaning area and a bigger clean grain elevator.
Since going to the bigger head we've been lucky enough to have somewhat drier harvests on corn moisture. The first year we had trouble in 26 moisture corn with wanting to take it out the back. Not enough wind and enough sieve. Since then it's been more of clean grain elevator issue when the corn has been drier. I pick alot of 15-22 moisture corn and yield ranges mostly 210-260 bpa. We just have to slow down and most of the time run slower than would like, but when we started this 4 years ago figured that deere would have a machine big enough to handle it by now.
At this point in time, I would not want a bigger header than a 8 row for compaction reasons. We can fill the combine with an 8, albeit we have to run faster than I would really like. We have 1050 Michelins and run 17-18psi with a 8 row and standard bin extentions, I do NOT want to run more pressure than then. For a bigger head I would have to go to 800 duals, and that is less pactical for road travel and storage.