Keep breaking studs

[01xjcny]

so i spent the day on the phone with mile marker and their engineer says he has never had any problem with the set up i should be able to run a much bigger tire if i wanted to. I have come to a conclusion it has to do with my wheels, the studs our dorman and are grade 8 and have .279 on the head if it means anything, i went to order studs from mile marker and they suggested i go to the part store with the part number they gave me to save shipping so i know i have the right stud installed . i will load up pics to show kinda what i am dealing with. today when i pulled the lug nuts off to take a pic there was a sleeve/insert of some sort that came out of the wheel never have seen this before
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[TripleZero]

The inserts are no big deal. Some wheel manufacturers use them depending on the style of wheel.

Now onto your pictures, from what I can see, either the studs were bad or the lug nuts were over torqued. Proper torque for Cherokees is 85-115 ft/lbs. I would recommend 100 ft/lbs torque(happy medium).