Thank you all for the replies. I got the idea about blocking my blocks from Sharon Schamber, as I remembered seeing her do it when I was watching her videos a few years back.
I did decide to go ahead and block them all, and have about 12 more to finish. They may not all be exactly 10 inches, but they are a lot closer, and I think the top will go together a lot better for having taken the time to block them.
It is good to know that the quilting will help keep them in shape, and they won't shrink back to original size when the quilt is laundered.