Truck was pretty bouncy - so much so that my wife refuses to ride in it. I will admit, it was pretty rough, and I grew up driving 4th gen f-bodies.
Jounce bumpers are in good shape and making proper contact.
Front Bilstein 5100's were 6.5 years old and somewhere north of 50k miles. Can't find OE ZW7 shocks, discontinued and Delco unobtanium (Part# 540-182 - ACDelco, Part# 12477738 - GM). Got some KYB Excel-G twin-tube specified for ZW7 (341343). Put those on and went for a spin. Improved, but still a little jarring.
Took off the QA1 Panhard and put the OEM back on and it's back to how we knew it to ride. I think it just made the truck too rigid and with our crappy soil here, the roads aren't great due to settling/shifting - ask my foundation about it

. Seemed that you'd hit a bump in the front and then when that was over, the rear hit it and bounced the front.