If you are going for bigger, I would also flip the big blocks of the hst's to point out - leave the sashing where it is and then add another border in the same fabric all around. The blocks of hsts will appear to be floating out.

I like the colors and that you are pushing yourself outside of your comfort zone. That is what I have been doing with the Bonnie Hunter Mystery quilt - no control and didn't know what it would look like when it was done. Has been a fun journey. I am behind, but will continue onward.