Not sure how else anyone here can help you. If your longarmer has no understanding of what's happening with your quilts, then whatever is causing it is not likely to be fixed. If it were me, I'd take those quilts around to other longarmers and ask them what they think is going on and how to fix it. Then I would seriously consider either switching to a different longarmer who gives you answers to these questions, or going back to your original longarmer with the information you've gained and watch to see what she does with this info.