REAVENATOR'S PROFILE

There are other ways to balance crowd control, too.
Like giving crowd control abilities cooldowns, or making an enemy immune to crowd control for a set amount of turns after being afflicted by a stun/freeze/whatever.

Then there's also what guild wars 2 does: every major enemy or boss gets several stacks of a buff that makes it immune to crowd control. whenever the enemy gets hit by a crowd control ability, it loses a stack, and once it loses all the stacks, it becomes vulnerable to the next crowd control ability, then it gets all the stacks back after it's hit by one. This will probably require scripting, though.

The simplest option would be to make the boss only resistant to the states, but personally I think this solution is too luck-based.