I have the Whiteline setup on mine - no nvh whatsoever with their bushing design. Vorshlag used the same setup on their 2011 GT race car, which was daily driven in its early days. The low nvh yet good track performance was well documented in their build thread.
I have Whiteline on my car, no additional noise. One minor issue I had was with the bolts they supplied for mounting the diff cover. I had cleaned the diff cover holes carefully to make sure there wasn't any silicone sealant left behind. The first bolt did not go in easily so I pulled it and inspected. The bolts are chrome plated and it appears there is some deposited on the threads, got out the tap and die set, cleaned up the bolts and they went in nicely. Also, I used a Lube Locker gasket under the cover so I didn't need to glue the cover on, makes servicing the diff much easier. No leaks either. I chose the White over some of the others that have mounts that clamp onto the axle tubes. If I was buying today I would probably buy Cortex's version because they have a torque arm that you can add and get rid of the upper third link in the rear suspension. Just my opinion.
Does the watts link help fix the bouncyness of the ride? When I'm driving on the interstate even when the road looks relatively smooth I can feel an up and down motion on the smallest of bumps. My 200,000 mile daily driver is considerably smoother.
sounds about right. There are bad isolators, springs go soft, shocks go bad, I would not redesign my entire suspension, I would try to isolate the problem. You may have some broken part, or cracked frame member someplace, the first thing I would do would completely inspect the entire suspension very closely.