Pony - If it rubs at 70%, but NOT at full lock, as in at around 2/3 lock it hits something, but not before or after that, then the turn stops would not be an issue...

....if it essentially hits AT 70%, and can't go anyfurther, then 70% has BECOME full lock...and the turn stops would help stop it, but you'd be losing way more turning radius than you'd want.

Key Questions for diagnosis/putting this to bed.

What hits what at 70%?

Can you reach full lock by passing the 70% hit point?