So I've been playing with the new AI for the past couple of days and I can definitely say it's a good bit smarter than it used to be.
Started simple by repeating the same number over and over on my turns and it picked up on that really well. I tried to use the mechanic to fool the AI into guessing wrong as well by changing up after the third use of one number. It worked reasonably well on Bigwig and Hazel, though, Hawkbit was a bit more fussy and didn't always play along. Not to mention that they all had a chance of guessing the right number before they figured the pattern out, which made it a less than ideal road to victory.
Then I went and did a pattern of 1, 2, 1, 2 repeated. Not a great strategy for winning, turns out, but no one seemed to pick up on it and I doubt it was meant to. Though, Bigwig did say "I second guessed myself" a lot while I was trying it on him. Not sure if that phrase indicates anything in particular, but it did make me feel smart. Or, at least, smart compared to the game. I also tried a pattern of 123 repeated, which had much the same results and equal success. Most recently I tried to see if they could pick up my guessing pattern by guessing the same over and over, but nothing doing there. Some ideas there.
Hawkbit actually managed to fool me once with his hint, despite your warning. Didn't let him do it twice, but I think it's a great little surprise for an unsuspecting player. And I quite enjoy making him feel shame and humiliation when he does it now. I like that Hazel tries to help me out, but I feel like there should be some logic to when he hints. Like, if you're failing pretty miserably, he's more likely to give you a hint.
Overall, definitely liking the AI and would love to see it get a bit more complex. I hope any of what I've said has been helpful.