If you were going bigger I'd suggest the Vitorria Terreno Mix, but for narrower I really rate the MXPs not tried the tubeless version yet but the older version have lasted well and provide great grip for CX in most conditions.
I like the 32mm gravelking SKs. When they're set up tubeless they are pretty fast-rolling on the road and great on hardpack gravel. They're not good in mud but are great for mixed terrain.