I haven't had an issue on my Buggy yet, but I have stripped a servo on my
ET48 2.0, I'm thinking it was more the servo than the truck though. I have a ProModeler servo in my Buggy and it has been good, but we went into Lockdown before I got a chance to really give it a hard time at the track.
I have loosened the servo saver off a lot on my Truggy and it still has plenty of steering, it is on my basher though so it's not as critical. In my race ET and EB I have them set up as per the manual, though it does seem very tight and I'm sure I could loosen them off without creating an issue.
Have you stripped the same brand of servo 3 times or are they different designs? I'm sure you've set your end points up in the radio also?