The Maxxis Raze isn't too bad, really. I like it and in all honesty I should use it more often. Last year I went with a Panaracer Crossblaster up front and a Kenda Kommando in the back and these rolled as good as you can in the mud. They were a great general-conditions setup, too. Only real problem was Masters Worlds and then *everybody* was hitting the deck. It was more of who had good technique than tire.
This year I've had moderate success with a Vittoria XM/XG set up (XG up front, XM in back) but I don't like the small side knobs on the XM as they'd squirm under me on turns in the grass, hardpack or pavement. I've also run a modified set of Duro HUPs that worked fantastically. In the soft grass that we were churning into mud you could hear the front tire ripping the grass like velcro. The Duro MoeJoe isn't bad as they've got some decent side knobs and the center doesn't pack up too much.