Now that you have cleared the biggest hurdle, that is getting the machine to tie properly, you can make the decisions about what to replace next or whether it is worth doing any more to it at all. The education you have gotten getting these knotters working applies to all balers of all brands basically.
Those wind rows did look a little big, more of a not clean edge than anything else, but if you were moving slow enough they should have been fine. Having all the pickup teeth will make a difference. As you work more with baling you will learn that it is very much an art form and not a science. It is really the operators ability to read the hay going into the baler, as this will determine the quality of the bale being made. Ideal bales are about 12-16 strokes, and should weigh in around 35-45 pounds. Small windrows are okay if you pick up the ground speed to compensate. Look behind the auger, you should be rolling hay up to the top of that chamber so that when the feeder fingers start pulling hay in the first compression takes place as the fingers pull in under the wedged portion the feeder fingers run through.
How do the sides of the bales look that are on the knife side? Are they a good clean cut, or is there a small bit of uncut hay at the top of the bale? If they are not clean cut, look at the manual and find the section on how to adjust the plunger. There are pretty tight clearances all around on the plunger, but it should still run very easily when you turn the flywheel by hand. If the baler is not straight, then these adjustments very much become a do the best you can kind of job.
Any other questions, you know how to get a hold of me.