Here is a website with good suggestions.
https://www.stitchingthenightaway.co...stitch-pieces/
There are some beautiful examples of the type of quilt you are doing.
https://www.bing.com/images/search?q...ares&FORM=IGRE
Warm & Natural batting has a width for quilting of 10 inches, which means you have to have a seam every 10 inches each direction. This might work well for you. There are ways to pre-shrink the batting so you don't get too much of a crinkle look. Or find a polyester batting, which doesn't shrink hardly at all, that has larger inch quilting requirements.
I can't wait to see how your quilt turns out. Your handwork is beautiful.