Good for you...when I saw the 'glue' idea, as a quilting teacher I almost fainted, as that would have been a disaster. I have a Janome 10000 that I love and have even used less expensive Janomes successfully. One of the reasons I bought Janome is that buying the extra feet is very reasonable.
I think it was definitely the bobbin tension. I've had almost every machine and a Bernina for years which I loved, but never owned a Bernette. However, if you're using a Bernina Artista, that's a beaut, too.
Good luck -- remember in quilting "glue" is a 4-letter word!