Having been one of many who had the idea that bigger was more stable and prop. lift efficiency was the key factor, The penny finally dropped and I realised that the FC computer determines the level of stability and all of the other factors just cloud the issue by being less than ideal. I made my reluctant u turn and never looked back. I came across this video which pretty much confirms my most recent thoughts. What you don't want in a successful design is Heavy motors with heavy props. long arms, and a lot of global inertia. What you do want is fast response......https://www.youtube.com/watch?v=R3NLWxJ1N5U
An interesting combination with amazing results.