I've followed the steps to correct the Square and achieved the same result as you! I really appreciate your advice on approaching and solving the problem. I'm going to try with the Oval at a later date.
I'm quickly learning that for smaller sized objects to design them on a much larger scale first and scale them own to meet the need. For whatever reason, I'm reading a lot of things about how sketchup doesn't deal with things on the small scale as effectively.
Thanks cotty!