I don't understand the layers not sewing at the same rate here, sweetie. Is it the tension?
Machines. Well, I would love a new one. I have an older babylock and a brother. Both are very basic machines with the babyloc being the higher priced. I purchased the Brother as a back up at a Hancocks a few years back for like $100. Believe it or not, I love this machine. Now it is supposed to self thread but I have never been able to get it lined up and the Hancocks around this area all closed up and moved away.
I am certain some here will give you much better advice. I tend to agree with your Moms. However I would love a fancy one and keep my others for the basic stuff. i think that is what you mean and most likely need. LOL. Big hugs, Kena.