You don't say what size quilt you have. I make small, charity quilts and also glue baste. I have no problem sewing from side to side.
On the other hand, I can't sew straight to save my life. I've tried using the pointer-guide-thingy on my walking foot, but it looks like I'm trying to meander. On my last one, I finally took the time to mark the crosshatching in Frixon pen. Problem solved! All my lines are straight as can be.
Tate