I had that issue on my jato until I put a brace on the rear tower to the middle of the chassis. Also added a shortened wheelie bar. Now it's very rare that I break anything on it and now that it's brushless... I send it to the sky.
Might be able to make something similar for your rustlers:
I enjoy my traxxas trucks, and my HPI's, and my Losi's... and my arrma.
Everything has a limit and honestly, I've spent more time working on my outcast than the stampede 4x4 I use to jump/run in the exact same places. The stampede is lighter, so the damage is less and I run it just as, if not...