nanna-up-north

Good Morning, I'm working on paper-pieced blocks from Betty Blais' pattern, Kimonos. I was thinking about this all night and finally decided that I should ask all of you this question. When should I remove the paper on the back of the blocks?

I haven't trimmed the blocks down to size yet.....and I know that with paper piecing the fabric grain goes in all kinds of crazy directions. If I remove the paper before trimming, there probably won't be as much distortion later. The paper is holding everything in perfect shape at the moment but when I quilt it there might be more chance of it not laying flat if I wait to remove the paper till the whole quilt is put together. What do you think?

I have 4 more blocks to go.... 20 total to make this a bed quilt instead of a wall hanging. Since I started this 5 years ago, I'm wanting to get it done and off my UFO list.