Don't mind my other accounts, I only use them for a few days when a new version is released so I can see what's new and help testing without risking my main account. I never copied my main AIs to any of them.
I'm playing only with my main account and my winning ratio went up to 78% and back down again to 77%. The reason my ELO is going down even though my winning ratio is still constant is because I was at 1850+, which is unsustainable with a gap of 200 points from the rest. My draw ratio went up too. I may lose the top spot eventually, I'm changing all my AIs very aggressively and trying some out of the box strategies, which sometimes fail really bad.
I agree that a lot of new players showed up and made the fights much more challenging. Kjr is giving me a hard time, which is good, you're forcing me to improve my AIs after each match. In general the game is getting better and better.
Btw, I'm not that concerned with my ELO or winning rate, I just do a lot of testing before deploying because it's how I like to play the game. I like to get my best strategies, search for weak spots and counter them.