Very good suggestions re: adding tongue weight, tires and heavier TV.
As a Swaypro user, I was wondering how many links you used when you hooked up during that trip?
And you say the dealer set up your Blue Ox... when TT and TV are level and unhooked, does ball sit about 1.5" to 2" higher than coupler? After hookup, is there equal or very nearly equal "squat" on both front and rear wheels of TV?
If the you are comfortable that the hitch is indeed adjusted properly, changing the amount of tension (by adjusting links) and evaluating in those winds would have been interesting. Certainly, it would be a very good idea to CAT the rig and let the measurements speak for themselves.
If you haven't read it, here is the installation manual for the hitch:
I really like mine though my rig is much smaller than yours. The BO makes the TT and TV feel like one unit moving together...even in gusty winds. I've not experienced any sway at all even bucking some 20+ head/crosswinds.
Update: Instructions say ball should be about 1" higher than coupler.