Did the limits change again?
The limits are, and have been from the beginning, dynamic. They are not a specific number of regions: the limit is
1/3 of the currently human-owned regions on the continent.
So if you just let a few regions go rogue, chances are, you'll still be (roughly) the same amount above the limit, because you will have reduced the number of human-owned regions too.
It can be a reasonable thing to do if you're just a few regions over the limit (though since this is a specific intervention due to grandfathered alliances, that will be effectively irrelevant in the future), but it's never going to get you anywhere if your bloc owns 2/3 of the continent already.
