Thank you for all of the help... I think I finally got it!
It was a combination of a little of this and a little of that. I cleaned the machine (found a lot of fuzz and even thread wrapped around an axle). I also did the bobbin tension test in my hand and the "yo-yo" tension test and tightened it up a bit. I have really sped up the machine, and I think it is consistant with the pace I'm moving the fabric now. I have practiced on the scrap sandwhiches and I think I'm ready to tackle the quilt again!! Thanks again!