My Jato (2.5 model originally) is all stock except for RPM arms F/R, Front bumper (wide), Traxxas CVDs, and a couple oddball aluminum shock housings. Bulkheads and shock towers are factory originals and I've yet to break them. My transmission brace (that goes over the top of the clutchbell) broke and I just CA glued it back together. Still haven't broken it again.
If you're breaking lots of parts and you're using some alloy stuff like shock towers, get rid of the alloy crap and stick with plastic. If you're still breaking bulkheads and/or shock towers, you need to learn how to drive.