Decided to walk another one all the way through. Wanted to try *not* pinning, getting closer to a scant 1/4 instead of a generous 1/8th, and squaring off as needed (gotta keep the Olfa set busy). Didn't take any longer (even though I ripped out a couple of the longer seams to do-over). I like it better. Not perfect, but better.
*Think* I'm ready to tackle assembly-line production of the last 78 blocks.... *gulp*
Here's the 2nd block.