833 Transmission won't disengage at stop after 100 miles.

I'm confused you have pictures of two different "z-bars"? which one is yours?
One of them looks modified with an extra strap. I'm guessing somebody modified it. If you have a heavier than stock clutch, that isn't necessarily a bad thing, because I've peeled that arm off of the cross-tube a couple of times, but perhaps someone clocked the arms incorrectly so you're not getting enough travel out of the bellcrank (z-bar)