I think it's really hard to break the shocktower part on the 720 because it's protected by the bodymount piece.
This will take all the impact now and is flexibel and so doesn't break.
Do you mean the 2 poles that stick out of the back?
That's meant to keep the body from getting under the tires during refueling and racing.
On the 720 there are special holes made for it.
But on the 710 it makes the shocktower even more funerable to rear impacts.
Do like what dj did to the body poles, placing them even more forward, will do that on my car too.
I am desiging a new part to mount the body on, it's lower and more forward.