Well technically you installed something that wasn't engineered by the manufacturer or taken into account by the chassis stretcher or factored in by Hellwig. So the extra ~240 pounds you added in addition to your normal carrying weight is a big game changer for rigs that typically travel close to GVWR to begin with. If you also have your native tank full, its probably a safe assumption that your rig is quite heavy going down the road.
I would have been happy for you if the adjustment helped you, but I can't say I'm surprised that you ended up with an experience contrary to the majority.
2015 Greyhawk 29MV