A photo or two of the WDH and TT + TV hooked up might help a little.
Not sure why people immediately shoot from the hip and say a Hensley is the solution without knowing what all the factors are. Is the TT nose high, level or nose down? What are the tire pressures? Is the hitch set up to transfer weight to the steer, drive and TT axles correctly? Is the fender height restored to the TV or WDH manufacturer's specs? Maybe the TV shocks are worn? I know going to HD Bilsteins helped a lot with our truck.
Maybe upgrading to the Reese dual cam setup would be the way to go. We tow a 29' 7K lb. TT and have the Reese DC. I've towed with and without the cam arms installed and there is a huge difference. I really like the DC's pro-active self-centering action and I really DON'T like the feel of towing without the cam arms installed.
Having a rear kitchen doesn't automatically mean it will have light tongue weight. We have a rear kitchen and by the manufacturer's dry weights, the tongue wt. is a bit over 10% but when all loaded up for camping and all mods and upgrades done, it's just under 15%. If we were to tow with the fresh water tank full, it'd be over 15%.
Going to a scale will give you lots of invaluable info. You may want to set aside a few hours there if you want to play with the tilt of the bars and bar tension. I did that last year and it took quite a while. The CAT scale only charged $10 even with all the re-weighs I did. As long as you stay out of the trucker's way it's all good. It's a good idea to take along a 3' stick or pole because the call button is waaay up in the sky for semi-trucks.