I had a similar situation, except I started with an Expedition and blue ox. When I upgraded to a F250, the trailer still didn't tow comfortably with the blue ox. Like you having to make constant corrections and still getting blown around, and it actually seemed to tow better with the bars disengaged.
Bit the bullet and got a ProPride. Now on a 6k mile trip, about 3k miles into it and I am completely satisfied with how the rig is towing. So glad I made the jump because I'd probably be back home if I still had the sway pro.
Personally, I think that these larger bunkhouses (with the rear slide) are not configured for the best towing experience. The axles should be about 1-2 ft further back, but they try and keep the tongue light so they can claim 1/2 ton towable.