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I used stock studs for 4 years of auto-x track. I have 3 sets of wheels and rotate tires around at auto-x and track events during the day. Never broke a a stud, even use impacts.
Thread you lugs first by hand vs buzzing on with an impact, inspect your threads every so often, and don't use the stock lugs. My moms Forester broke a bunch of studs in the past too, I started working on it vs dealer and never broke one, other than the first time I took lugs off.
I have a feeling its related to using shitty lug nuts vs studs. I found the stock lugs to be very soft, so over torquing and damaging the threads is very possible
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