Can you try one other tweak: Bring the circle forward so that it arcs across the top of the open book and is behind the book on the lower left side. Thanks for your efforts - I still like your overall design best I think.
On #38 I like the different color on the slogan but I think the circle needs to close where it crosses the top right of the book - it looks like a horseshoe now. If you prefer it not close then leave it open on the bottom maybe.
Going back to #38, I have a thought for a new direction - what if we put a very simple stick figure head with arms and hands outstretched at the end of the arc - like the person is flying across the page of the book and the arc behind him is like his orbit? Thanks for working with me on this! We appreciate your participation.