My current company does this also. The team is slightly smaller with 6 but we are in the process of taking on a couple more developers and the peer review process will still remain. The CTO like yourself reviews all code commits as a final sign off once the change has been through a more thorough peer review. So it is possible to do 100% peer reviews.
Your point 10 highlights exactly how I feel about it.
Your point 10 highlights exactly how I feel about it.