I’ve used 2.1 Mud X and also the narrorwer Beavers (can’t remember size).
Mud X are amazing in thick gloopy mud, they dig in and shed great, they’re amazing on off camber stuff. I also found them fine for all other use, I don’t remember ever being nervous on rocks or mud with them.
Beavers are nowhere near as confidence inspiring in any situation, but there is a higher volume one that you could try. Personally I’m very dissapointed they don’t do the Mud in 27.5 or else I’d be throwing the Beavers out.
I’m using Continental Baron on the front and a Purgatory on the rear at the moment instead of more mud specific tyres and have a good deal of grip in most conditions with this combo 🙂