Are my torsion Bars Weak? '65 Dart

And how would I know?

We have all new front end parts (except t bars), we've been to the front end shop 3 times now, wearing out tires, each time they adjust the height up, line it up, and off we go. slowly we notice the front looks low again.

Now the tbar adjusters are almost bottomed out, and the car is riding low again.

the brace where the tbars land looks fine, no rust.

What do I look for now?