i got a slick linear cable as well
no stretchy-ness there
didn't know the 2's fitted the same way
not seen one up close
T1000's
i didn't use the cable locator that came with the brake prefered the posi stop
hence no spring for me
thats the only weak point with PB's the return of the cam after braking
make sure its clean and greased in its tracks
the springs will def help as would a sprung lever - all help it go back
these and BOAs are my fav OS brakes - cos they work