I've been grinding the game pretty hard recently, but the best time I end up getting is 2:22. Are there some insane strats that I don't know of, or am I making a lot of mistakes?

It really just comes down to more grinding and minimizing mistakes. One thing I have noticed in your run is that, at the start of Chapter 4, when you check for the amount of sugar, press the period key to skip the narrator's dialogue, so you hear the Owl's dialogue sooner. Also turning on subtitles helps because you look at the subtitles instead of listening for what he says. Aside from that you pretty much have the gist of the strats, it's just a matter of following the route without errors, and going fast.

Sub 2 took me a while, but I eventually did do it, and I thought sub 2 was as good as I was going to get for a while. But then I dug even deeper and played even better and still managed to get better time, eventually leading to what time I have now. Point is, there is always room for improvement, it's just a matter of keeping at it, even when it feels like you've hit a ceiling, it just means you gotta keep going and break through. So keep at it and sub 2 will come when it happens. The sky's the limit.

Yeah I finally managed to break two minutes, and get a 1:50 off camera. Thank's so much for your help!