I can't comment on your set up but the bouncing or porpoising you feel may well be due to the road surface. On some highways, especially concrete ones with expansion joints running across the road, you may encounter this bouncing. If this porpoising disappears when you are on other types of road surfaces, then your set up may be ok.
I've noticed this same problem when travelling with our 5th wheel on some stretches of concrete highways.
Perhaps others who have more knowledge than I do about TT's and their hitch set ups will chime in and offer some suggestions.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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