So to be clear its a front axle that is going? Is it the same one that goes every time? is it breaking or tearing the boot off?
If it is a front and on the drivers side I would go check your motor mounts, I went through 19 axles on one of my rigs before I replaced the Left side motor mount never again did I break an axle or tear a boot, as for the tire ware thats pretty much part of the deal, El presidente and I have our blocks cut at 17* witch helps a bit more, all said and done I do belive that Scott makes a pretty good lift there are just some cars that dont agree with certian things you do with a lift on them, there is one That was lifted at my place that just kept waring tires like crazy no matter how much angle we put in the blocks and one kept pulling boots off, if anything look everthing over really good under there and see if any thing looks out of place if so see if that could be something causing the problem...................................
Jeff