I prefer wide backs and prefer that they edge is torn so straight of grain--and I always buy a larger cut as it definitely will shrink and also if not torn, getting the straight of grain sometimes means losing about 8"! I don't allow to completely dry (and don't pre-wash my go-to Moda Legacy white off the bolt), shake it out, drape over the long arm belly bar. Then when I load it I use a spray bottle to dampen and get out any wrinkles/creases, roll it back and forth several times and let sit overnite ready for quilting. I do use my regular ironing board or padding on my old dining room table to do pressing on really creased wide back. Check with your Long Armer and ask if they do this too--if so washing and shaking out semi-dry will probably be enough.