You don't mention putting the feed dogs down. Try them down it does make the fabric glide better. I followed Leah Day and with one of my machines free motion world following her instructions with another machine it only works smooth
y with the feed dogs down. Also you need plenty of practise with bigger samples as the weight from a quilt and the sheer area to be quilted, stop and starting etc all make new problems. Also marking the quilt and following a pattern makes a new problem.
keep trying it comes eventually.