I look at it this way
It was an "Artistic Design Choice" and just let it go, practice makes perfect, but even then perfection is rather overrated
Hugs, you are doing fantastic.
I often cut down my blocks by 1/4-1/2 in to make sure it is square. Ensure you use good steam when pressing, it does keep down the "waviness" of the blocks (assuming it is a pressing issue and not a stretching issue).
The errors you are showing are so minor, I doubt very highly in a large quilt you will notice, heck even in a small one you wont notice. And if anyone does you just say "It was an Artistic Design Choice, I was going for that look"
