I can confirm that the bots are becoming better every day. The only thing I've found to stop them is to control payments manually.

I have the weekly payout system. It gets rid of bots because they don't get the payment and go away. It's not perfect though, because I think a lot of users who don't read the faucet rules get the impression the faucet is not paying at all, so my user count is low...
But maybe if you'd employ a daily payout it would be enough.

What helps too is to use custom built scripts (no one would make a bot specific to your faucet).

I'm developing a new custom CLAIM script that I think will filter out bots. I'll post here when it's done and send it via pm to anyone who will be interested in testing it.