huggybear, you didn't mention your unhitching procedure.
if you aren't using the jack, to relieve the pressure, you'll always have problems disconnecting, even when the setup is right.
we have the same hitch and have only needed the pry bar to unhook once, on an unlevel site.
you have to jack it up high, to relieve the pressure on the bars, then lower it to get the coupler unhooked from the ball.
that's why many of us get an electric tongue jack, to make this process easy as pie.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC