I also have been running Duratrac on my last two GCs. Since new on this latest GC Overland. Lately, I kept thinking they (or something) was getting noisier than usual in the front. I just noticed uneven wear on the front tires. Very weird uneven wear. I found something similar on the net, and it is sometimes called "scalloping" (which would seem to be the cause of the excess noise). Basically, when you look at the front tires from the side, looking straight at the wheel say, the external knobs are worn on a slant from front to back. Moving your hand on the outside portion of the contact area, you feel the difference in height from front to back of each knob. Never seen anything quite like it. A handful of "reasons" are listed as possible causes for this, one of which is alignment. Also soft shocks, wheel bearings, wheel balance, tire rotation (lack of)... I run them at 36 PSI. They are not great at cornering on water, even with all the bells and whistles (anti-slip, etc...), I have had all for wheels slide sideways a few inches on wet pavement. I guess the easy fix is slowing down a little.
Is this similar to what you are seeing ?