Wait so when you say 22 instead of 28, did the toothpick come out clean or were you just going off the timer? Cause that's the real question here. If your oven runs hot or the batter sat out too long before it went in, 22 could be totally done, but if you pulled it early on purpose to chase that moist thing then yeah, that's on you. Also what did those three people actually say, was it just texture or did it taste like raw flour too? I've had underbaked stuff that was gross and underbaked stuff that was fine, so the line matters. Did anyone who kept their slice say it was good, or did all twelve just eat it quietly and hate it?

Backward planning changed everything for me too, glad you figured it out.

Been there myself, binged a whole season of some crime show at 1.5 speed and couldn't tell you who the killer was by the end. The thing is, if a show is worth watching at all, it's worth watching at the pace it was made, otherwise you're just staring at moving pictures. Good on you for going back and giving it a real shot.