Another thought - could the quilt be bunching up behind the foot, causing it to not feed through, or even getting caught on the IDT. Both have happened to me and I could never get used to using a walking foot or the IDT.
Yes, Gay, I have seen evidence of this already. It improved when I was able to set a piece of glass behind my machine. It also made the remainder of my table the same height of my Sew Steady extension table. I'm definitely going to keep an eye out for a way to remedy this pooling. Thank you.