As downtheroad mentioned, I would check the weight rating on the bars. BlueOx bar ratings jump from 1000 to 1500 lbs. You're pushing 1000 lbs tongue weight with empty trailer. If the dealer set you up with 1000 lb bars, they may not be transferring enough weight. The model number for the 1500 lb hitch is BXW1500.
Other possibility could be, the hitch ball is set too high, or, maybe a defect in the hitch.
My tongue weight fluctuates between 975 and 1200 lbs. I have the 1500 lb bars. First time towing (right after initial install), I actually had a bar crack. I called BlueOx and sent them pictures of the bent / cracked bar. They sent a new set of bars, overnight. Been three years now, without an issue.
Ditto on the long handled ratchet and a deep socket.