doesn't sound too fun in the root infested southeast. That's where a completely soft knob really pays off to have the whole thing deform to rock hard root balls in deep loamy dirt...
I'm running the Michelin MTNX Xtreme 2.2 with the dual compound on my trail bike. It makes the knob ALOT stiffer than the DH version in terms of staying "stood up" and biting into the soil. At first I thought (from a feel it with your finger test) that the new rubber was a lot stiffer overall...until I did a few XC rides and felt the outer coating grip and sorta stick to the ground.
I love them for trail riding b/c they do accelerate faster and the knobs don't squirm as much, while keeping the tacky feel of a soft compound.
But I cannot see me running a DH tire with a stiff base to the knob b/c it does deflect more, regardless of the outer coat of soft rubber. Basicly, I'm happy with soft compound tires.