If you were driving in serious wind and felt no sway, then I think you have an excellent hitch setup. As far as anti-sway vs sway reduction vs sway elimination, it is my understanding that there are only two hitches that "eliminate" sway - the Hensley and the Pro Pride. All the other hitches that claim to be "anti-sway" tend to reduce sway rather than eliminate it.
That doesn't mean you need a Hensley or Pro Pride to be safe as your experience indicates that your hitch does very well at sway reduction.
I can say from personal experience (with a previous bumper pull trailer) that the Hensley definitely eliminates sway, but it is not cheap. Even with the Hensley, I could see very slight movement when looking in the driver's side mirror - probably less than an inch.
Also, from personal experience, if you are having significant sway, you will feel it in the tow vehicle.