After nearly 20 years in the patchwork/quilting game, I've finally become a little bit smarter than I used to be and have taken to making test blocks. I'm glad I did for this twisting heart project which I found here on etsy. Here's my test block.
I'm not sure the black and white fabrics work. Either there is too much white on the black and vice versa, or there is too much contrast between them (ie, they are Light to Dark, rather than Light to Medium, or Medium to Dark). So back to the drawing board.