Have you researched other alternatives other than what you are using ?
I'm not saying it's bad, I'm curious as to why you have chosen those aftermarket springs. You might know more about this than I do. :) Read the links below for info.
I do not know if the TL Stableloads will fit your rig or not, but I installed them on my top heavy truck camper and they kicked in my overload leaf spring greatly improving the side to side body roll.
On my class c that I have now, I was getting pushed around by crosswinds and passing trucks, I installed a rear track bar and that plus a good positive caster alignment helped a lot. I also changed to Bilstein shocks up front and Koni FSD's in the rear.
At this point I'm at now, I can lead the pack through the twisties on back roads.
I will install more H.D. sway bars front and rear when the time comes, but for now, I'm happy.
I would take it to a scale and weigh get weights on each side. Your rig could also have too much weight on one side , then a set of air bags with individual bad adjustments to make it ride level from side to side would help.
https://www.torklift.com/rv/stableloadhttp://www.ardentcamper.com/blog/steady-as-she-goes-stabilization-and-safety-upgrades-for-class-a-gas-rvs