As already said ... practice-practice-practice.
I'll toss in another suggestion .... make your practice pieces larger.
From your pics, they do not look too wide.
As I practiced, I found I did better on larger pieces .... with narrow/small pieces, I was working too hard to stay within the fabric edges, and lose your FMQ rhythm. I worked with a bunch of 12" squares, though I think 16" or larger would allow a better feel.