I paper pieced the Farmer's Wife Pony Club quilt--all 90+ blocks. I removed the paper after each block was completed. I kept them on my flannel design wall so they'd stay nice and flat. When it was time to sew them together, there was no distortion even tho a lot of edges were bias or off-grain.
I also pp a Storm at Sea wallhanging and didn't remove the paper until the whole thing was sewn together--what a night mare that was! It took forever to get the papers removed and was much more difficult. The results were the same-no distortion but for me, I'll remove papers after each block is complete.
That's an adorable pattern and l love your block.