The rate limits aren't that aggressive and have a decent amount of burst, you can get about 10 moves done in 1 second before you hit them and start getting throttled[1]. And of course you can run multiple clients (I account for this too, but I'm not that aggressive because I don't want to punish many people NAT'd behind a single IP)

[1] down to something like 3/sec?

I figured the multiple people per ip would be an issue, was wondering if that might be at play here. I thought you said it was already at 3-4/s and I doubted it based on some of what I'm seeing. 10/s tracks a little better.

As to what you should change, I can't say. It's in the wild now lol.

Yea seems the rate limit should be stricter, I made a quick script to do 1 move (capture) every 150ms, doesn't seem to get throttled.

I like how generals.io did it where they explicitly made a bot only server/version.