We have a heavier truck and Airstream combo than you, an F150 crew towing a 27FB, but did tow it for 6 months with a Blue Ox BX1000 (1000 lb bars). I am posting on this thread to share with you my findings while using that hitch.
Blue Ox wants a "bend" or "bow" or "arch" in the bars when set to ensure proper weight distribution and sway control, as they are tapered and designed that way. When I setup the Blue Ox on our coach, I was able to return the truck front fender height to within 1/2" of unloaded height and the rear to within an inch of unloaded height, dropping 7 links and hanging link 8 on the rotating bracket connection. The combo towed well, although when I found a super deal on a used ProPride I upgraded.
Last week I setup the Blue Ox on my 20' equipment trailer, carefully remeasuring and re figuring everything with my typical load of a tractor and implements on the trailer. Sure enough, dropped 7 links and towed it yesterday. That trailer never towed better than it does with the Blue Ox.
Take your time, review your measurements and settings, re-read the Blue Ox book and dial it in carefully, and I bet you can improve your ride.