i have used warm & natural ALOT over the past 10 years- and at times have quilted about 9" apart- going around blocks that did not get quilted further- those first quilts are still holding up just fine.
warm and natural has a scrim (which is a 'net' the cotton is punched through- a base) it holds the fibers together and makes it possible to have more open areas without the worry of migration.
it is the best batting choice in my book anytime i want mostly open large quilting designs.