Felix,
I fully respect your opinion but let me just say a few things.
First, nobody claims that car tires are for everyone. It's a personal decision and whatever you prefer is perfectly fine. It's true that only a very small proportion have a car tire on their bike but I wouldn't conclude that they're less safe or less efficient than motorcycle tires. More riders wear 1/2 helmets than full face helmets on cruisers and this doesn't mean they offer better protection. See where I'm getting at?
Second, I've been riding for almost 40 years and I've seen VERY FEW people pushing their bike to the limit on open roads, and even less pushing a cruiser or a touring bike to the limit. I'm not an aggressive rider but I'm not a wuss either. We rode more than 1,000 miles in the Smoky Mountains last summer where we saw 000s of bikes and nobody was riding much faster than the others, besides crotch rockets.
Third, I rode the Dragon with several other cruisers and touring bikes and some of them had CTs. They were perfectly fine, neither faster nor slower than us and their trajectories were identical to ours.
Fourth, you are one of the very few who say, after having used one for 2,000 miles, that CTs are not for him. 99.99% of the people who have tried claim that they will not go back to MTs.
Considering the symptoms you describe, maybe your rear tire was not properly inflated? Out of curiosity, what was the sweet spot you determined, in terms of air pressure? Maybe your rear shocks were low in pressure?
Not trying to sway you back, by the way.