You can try to have them force match the tire and/or rotate it on the wheel to see if you can reduce the weight. I had to rotate one of my 35's on my wheel 180° and then another 15° or so when I swapped from balance beads to stick-on weights recently.
But we play this game with all kinds of aftermarket tire & wheel combinations. Chunky M/T tires and big aftermarket wheels tend to be the best combination for needing lots of weight. Sometimes you just get a tire that is a bit out of round or a wheel that isn't formed quite evenly. We've had to send tires and/or wheels back to the seller because they required pounds of weight after road forcing and force matching.
For reference, x31 .25oz weights is about 7.75oz or just under half a pound; which is a bit but not out of norm for big off-road tires in my experience. I keep bugging our manager to get some .5 and 1oz boxes for those things because it starts getting messy looking when you need to put down 4 or more oz in a spot.