I am hesitant about cutting chunks into scraps, too. My current WIP is a scrappy and my plan calls for 200+ 3.5" neutral fabrics. I have some"precuts" but only about 20 of what I needed. So I went to the chunks and cut what I needed. Did I cut a 3.5 when I could've gotten at least a 5? Yes, but that's okay, I cut the remaining down into 1, 1.25, or 1.5 and added those to my precuts...oh my more little pieces!