I believe that Bratti's tolerances are based on the hour, earlier in the night they (as you said) are statisfied rather easily, but in the later hours it's a better strategy to ignore them entirely.
As for Bratti being annoying, that is rather in-character given his name. Each doll is afforded exactly one personality trait based on what Gremlin thought was arousing that day, it doesn't matter that their characterization is flatter than Jerri's chest if they're sexy. So shut up about "good-writing" and look at their boobs (that's something an actual member of this community told me). Subtlety? Never heard of it.
Seriously, do not research the lore unless you want me to end up like me.
The animatronic movement in the original FNAF-1 was a simple 1/20 chance (the equivalent of rolling a d20 in real life), but the fact it's 1/21 concerns me. Because it means that Glacier/Pastelnerd (see, he has nerd in his name, that must mean he knows what he's doing. Right?) probably overcomplicated a system that didn't need to be. Tthe fact he tried rallying for more programmers is very telling about his own abilities.
Also, Bratti isn't a she! They're a...
they're a...
huh. Canonically, they're a doll, but they can drool; implying they have a digestive system. So not even the basic rules of the gremlin-verse makes sense.
Believe me, I don't like being negative. I tried to stay optimistic about this game, but the more I thought about it, the more I lost hope. Pastelnerd, if you're reading this, I'm not saying of this to be mean, I just fear you bit off more than you could chew, and you have no other choice but to either spit it out or risk choking.
Well, that was a rant and a half. I'm probably going to get downvoted to hell and back.