I was going to say you don't really NEED the No-Hop bars, but that higher stance
definitely aggravates the tendency to hop. I say leave 'em in, OR lower the back
(which I see you don't want to) to the point where the suspension geometry is
brought back to something close to the OEM settings. Remember, even at stock
height they had hop.
Another thought. Pontiac had warranty claims on the upper crossmember. It's a
safe bet they
won't cover it anymore.