Hey Czar, love the bot.
With Serums (sorry for another point about Serums!), the bot seems to click each potion twice as it makes it (probably because there's a bit of a delay in the actual game while they're being made). I think this gif might explain what I mean a bit better.
See how it goes back to click the one that it's just made? I'm not sure if the bot is too fast for the game, or if it's something else, but yeah. Another possible way to counter it could be to make it click a different potion each time, not just to last available potion? I'm not a developer so I'm not sure how hard it would be to do.
Cheers again for the great bot, though.