I did and have often googled this, but I'm genuinely still unaware of something to match my wants. Personally, I've always found Swampy's great on wet rock and had enough bulk and volume to take a hard edge hit. Mud X are too easily shredded from my experience. Decent in mud but a liability on loose rocky stuff and not very confidence inspiring on drops.
I used a Purgatory on the front last winter and it was okay, but still clogged up. I tore the wall of it, but could try again as it's patched. I've got a Trail Extreme Smorgasbord on now and it's similar, but maybe slightly better on wet rock and root. No desire to run narrower tyres than these on a mix of terrain.
A bigger Beaver sounds nice