My guess is that if you are OK with smaller pieces, but not with larger quilts - you are intimidated by the size of the larger quilt so you try to move it faster.
Concentrate on a smaller area of the larger quilt.
Puddle (not roll) the quilt in an area around the area you are going to quilt. The puddle should be "loose".
Look at a 12" square of the quilt and NO MORE. Concentrate on just that 12".
Don't try to quilt more than 12" without having to stop and rearrange the "puddle".