Too much CMC? Let's see, we've had Flight to the Finish, Twilight Time, Somepony to Watch Over Me, and For Whom the Sweetie Belle Toils. Since most of the 26 episodes this season have been confirmed, it's possible that these four are the only CMC centric episodes, and yet one of them was also an Applejack episode, one was arguably a Twilight episode, etc.
Compared to say, fan favorite season 2, this is actually less focus on the Crusaders. (Sisterhooves Social, The Cutie Pox, Family Appreciation Day, Hearts and Hooves Day, and Ponyville Confidential. A total of five CMC episodes).
I think season 4 has done a great job of balancing character focus. Each of the fillies got an episode of focus to themselves + one group episode with Twilight. I'm not really sure what the complaint is here. I definitely don't feel like the Crusaders are getting too much spotlight, especially since each of their episodes this season involved different Mane Six ponies as well.