120 more blocks still required!
I wonder if you trim back your blocks? I prefer to make my blocks just a tad on the large side, even up to 1/4 inch bigger than what is needed, and then trim the blocks back accurately to the correct size. I find this works well for me; it makes sewing blocks together a breeze, and therefore results in a nice flat quilt top. It is however a very time-consuming task.
Maybe I have to trim back blocks because my sewing technique just isn't up to scratch?
Mmm ... Can't add, can't sew - but can still make a quilt.