I agree 100% I had a 216 JD wire tie for years and me and my dad did all the work on those knotters, As well as some work for friends on a few other 14t balers. Now, my experience is the twine or wire tension coming from the box to the knotter is very important. Next thing is your twine guides, the porcelin ones, check these as well. Make sure none are missing, make sure that they don't have grooves worn deep into them, If there are any rollers lube them with penetrating oil and be sure that they turn freely, Another thing I have seen is the twine routed wrong, make sure this is right. double check, find a manual and a diagram if need be. I have seen a lot of people try to time JD and hesston inline balers that had no business working on them at all. I am not a mechanic, but neither are those guys. I went to the dealer to ask the baler tech one day about setting up a hesston 4655 rail and roller clearance for the plunger. He had no idea what I was talking about so we went out in the yard and I shoed him on a new machine. He replied "Well We don't mess with those, there is no reason to, we just buy new rails and rollers and that restores your clearances, if they are that bad there is no adjustment to correct it."
I first thought about asking for all their worn out rails and rollers for myself, then thought better of that and said thanks and went home and set my plunger clearances with feeler gauges, took about 1/2 hour. Still runs today. Don't trust the mechanics all the time, They have their place but noone knows everything.