Like was said, if you only have one bar.. add a second $20.00 bar from Harbor Freight and see if that eliminates the remaining wiggle you have.
If you just have to have a more expensive hitch then go for it. I'm personally not a fan of Dual Cam and if I were choosing a hitch other than a standard WD hitch it would probably be the Equal-i-zer or the Blue Ox...
My next hitch is probably going to be an Eaz-Lift/Curt/ProSeries/Harbor Freight round bar hitch of the appropriate weight rating with two sway bars... I have ran a WD hitch with two bars when I had our last RV and it was a very positive experience... Especially once the WD was dialed in.
Thanks!
Jeremiah