Did they change the way statisticians work? It used to be 300 (a total of 4x exp) was the cap for a character no matter how many they had equipped.

Yeah, there's no cap now besides how many you can fit on your equips, so it goes all the way up to 9600% (8 on each piece of armor). Makes leveling to the max pretty easy.

I never had a problem getting to level 9999, it was having good enough gear to solo the item world in the land of carnage...

I've honestly given up on D4 for now. I got to Zetta, who I think is the last postgame boss at level 4000. All his stats are around 1,000,000. My guys have like... 150K attack and 1,000,000 defense, so I could probably beat him with just a little bit of effort, but it just doesn't seem worth it. Opening the the Land of Carnage is such a pain. I have other games I want to play.