Big surprise, you guys running mud tires and complaining about ice performance... Even the Maxx's that I have on my Jeep are not that great on the packed snow and ice. But they do acceptably well, and they do mud acceptably well too. It's called compromise.
I'm sure the STT Pro's are GREAT mud tires, but a great mud tire will always sacrifice ice and packed snow performance. If you desire better snow performance, I'm told the new AT/KO 2's are excellent, and the closest you'll come to a true winter tire that can be run all year long. I think Cooper ATW's are a bit better on ice, but a little faster wearing.
Everything has it's place... I loved my old STT's in MI, where I was in mud occasionally, and ice/packed snow a little less often, but out here in the wild west, where I'm as likely to see snot clay mud as ice and snow and slush, or rock of many kinds, I find the Maxx's to be a great compromise. If ice/snow weren't a concern, I'd probably opt for a set of STT's, or perhaps the new STT Pro's. (I
really
liked my old STT's...)
YMMV (depending on inflation pressure, temperature, available torque, vehicle weight, snow/ice conditions, etc...)