Oh,my. I haven't made a log cabin, but every other quilt I have made has been off at some point or I've had to scrunch some places and stretch others. Each and every one has been oooohed and ahhhed over by anyone in my world who's opinion I really care about. If you have to, take a break and return to it later. Good luck, it will be beautiful when you are done. I know that for sure.