The STT Pros had horrible wear characteristics on my truck. I had alignment checked a few times, played with different tire pressures but they were horrible. They were well balanced, and shocks were in good condition. Won't ever buy those tires again. They're a good looking tire but the wear characteristics make them incredibly loud and rough long before you would normally replace them. Then if you try to sell them, you can't get a decent price because of how they have worn. Waste of money IMO.
I've had my Toyo MT's for more miles than I did the STT Pro and the wear has been very even without any change to alignment, tire pressure habits etc. Confirmed to me that the STT Pro just doesn't wear well.
Box Rocket, I agree with everything you said. My ST Pro's have 20k on them and they are shot. Noisy to the point I can't have a conversation driving down the road, cupped at ~5k miles and feel like I'm driving on ripple strips at low speed. I tried everything you mentioned and nothing worked. The sad part is 50% of the miles were off road / dirt road. I loved them when new but the excitement wore off quick once they cupped. I even used the chalk method to get the pressure correct. I am currently running them at 42 psi. My next set will be Nitto Trail Grappler MT.