I have found that bobbins that are wound by the user work better than pre-wound bobbins some times. I think it has something to do with less tension on the user wound bobbins, but that's just my own observations. I have had good luck with both pre-wound bobbins and user wound bobbins.
I guess that this response is not much help,............sorry.
No one lives forever, the trick is creating something that will.