That's the same size MTR/Ks I'm running, put on in 2010. I haven't upgraded yet, but will probably do so in the next few weeks. As with you, they have been an absolute PITA. I recently had them balanced (again) after a recent bout of DW (again) coming back from Buena Vista. I've been pretty religious about rotating them every 3K miles so wear is pretty even on all tires. I had them road force balanced and a couple of tires are significantly out of round and all were out of balance, after only about 7,000 miles since the last balancing. The guy that balanced my tires said that the MTR/Ks have a reputation for the kevlar bands shifting over time, which explains why they need to be balanced so much. While the balance and out of round aren't the cause the cause of my reoccurring DW (this time it was a worn aftermarket trackbar, which had only been on for 35-40K miles, and a loose lower control arm) I think the MTR/Ks put a lot excessive stress on the existing components causing them to wear out quicker.
We are heading to Buena Vista again on the 14th of Sept so I'm going to upgrade before then, maybe in the next few weeks. I'll let you know how they work out.
The one thing I will say that the MTR's have going for them is a lot of tread depth.
Have you had an alignment done since you moved to the Springs? The last time I had one done was back in 2013 right after I did my lift and all. I can tell it needs another one but I want to find a good shop in the area that can do a good alignment on our type of rigs. I know that it can be difficult for them sometimes with the large tires and rims that don't have much of a lip or anything to grab onto.
When I first put the MTR's on, I had a hell of a time getting them balanced until I was able to get to a shop with a road force balancer. I used the balancing beads and they helped some until then, but they also destroyed my TPMS sensors, although that really doesn't bother me since I am always checking my pressure anyhow. When it comes to getting them balanced though I've found it almost impossible to find a shop that will leave the tire pressure alone. Every time I tell them the pressure is exactly where it needs to be for the correct contact patch and every time afterward I find that they've increased it. One time I checked it afterward and found my tire pressures from 51 to 55 PSI. I went back and ripped 'em a new one asking why they increased it contrary to my instructions, let alone why they put them 20 PSI over the max pressure shown on the side of the tire! This last time they told me that they bumped the pressure up to 36 PSI, I told them I had instructed them to leave the pressure at 30 PSI, they said that they balance them at that tire pressure and bumped them up to 36 PSI afterward.
They said they would put it back to 30 PSI. They turn it over to me 15 minutes later and I find the pressures 36 PSI, 34.5 PSI, 33.5 PSI and 32 PSI.