You fail at the DD/heavy hitters ratio. Specially, too many CAs. You need less of those, and more DDs. One CA removed should mean 2 DDs added.
Ideally, you can divide the DDs in 4/4/4/5 groups, and then add ships from other classes to each task force. Otherwise, you risk getting unprotected capital ships. If one of the CAs is actually Maya Kai2, that would help in the AA department. But it won't help with the antisub problem. That could make a task force with only 2 DDs devoted to ASW, but then the rest of the fleet has to stay close around Maya.
Similarly, for example, if one or more of the CAs are remodeled Mogami-class, then they are Aviation Cruisers (CAV), which could add fighter patrols, and improve AA capabilities. I'm also assuming that most of the CVL space will be devoted to offensive capacities (torp and dive bombers), rather than trying to go for an air superiority configuration.
You could make five groups with 4/4/4/3/2 DDs. But if you cannot add or remove ships, that will be the limit of how can you divide those ships.