New truck, New trailer, TONS of sway!

I recently took delivery of our 2015 Prowler 32pbhs trailer and towed it home with my 2015 f150 ecoboost pickup. The dealer I bought it from also sold me and installed a blue ox sway pro system. The ride home was downright scary on the highway. A 5 mile trip was about all I could handle staying in the right lane, well some lane and some shoulder, well below the speed limit. I even had a few panic and grab the brake box slide moments to straighten back out. I got it home and thought they set the bars too tight. The rear of the truck felt unplanted and very unstable. Today I hitched back up and went for another ride with less tension on the bars, which helped the truck feel more planted, but still had way more sway than I was comfortable with. I plan on re-installing the hitch myself, and also getting everything weighed up but I need to figure out what issues I might be faced with. The trailer is a touch over 8k empty, and has a tongue weight of 950lbs. The truck is good for 10,700 pounds, so I know I am at the higher end of my truck's capacity, but still within it, especially with the trailer completely empty. Any research I found made the hitch seem like a good unit, and the truck seems to carry the weight ok considering what I'm towing. Any thoughts, or insight is greatly appreciated.

Matt