I have the same thing with OME, drove me fxxxing nuts. After dicking around, I took it to a spring shop and the guy fixed it rather cheap. re arched them a lil, to even it out. I never take my vehicles to mechanics, but after swapping springs and having the same result I was quite annoyed. So I made an exception, they did it in no time. and it was cheap.
I assume it was due to being made for RHD and my truck being LHD, but then swapping the sides should work. Mine leaned either way, so who knows, didn't do that with the 30 year old factory springs. I know the old guy at the shop wasn't to thrilled with the OME leafs, he may have just been a miserable guy tho (maybe low blood sugar or he needed to take a good s***), cause I always thought they were pretty stout and I've had em on the truck 10 years and that was my only issue.
Anyway good luck! P.S. how's ur truck feeling in 4WD after the lift?