The funny thing about all this is that just cleaning out the bale chute completely to install them is the main reason the bales come out better. The bale is formed by the addition of flakes held in place by 2 side resistors and 2 - 3 floor resistors. If they are all plugged up with chaff, crud from many years of old hay residue, they are not even 'there' and the bale consistency suffers. The banana bale gets its shape from uneven tenstion (and length) due to an uneven charge (adjust feeder forks) and even from a missing bale chute. If the bale drops off before it exits the tension cage, its gonna be misshaped. Length issues are caused by a bad, slipping, worn measuring wheel and a misadjusted or worn dog clutch on the knotter trip. Setting tire pressure too high or wrong pressures on each wheel can cause an unintended trip, too. As would a bumpy field. For Heaven's sake, clean out the bale chute completely every year to inspect the insides, set the tire pressures, clean off the measuring wheel gear teeth, and check the timing. There should always be 13 - 14 flakes per bale unless your windrows are thin.
You'd be surprised at the machinery I've looked over, and the 'rules' I get quoted by hay farmers ("don't ever empty out that baler, it'll never work again.") So after 20 years its having some problems if it has not already self destructed. Try the simple stuff first... You'll be amazed at the mud, gravel, stones, old fence wire, hay rake teeth, sickle knives and stuffed animal parts I've dug out of bale chambers. And a Timex watch, not running...