What is the distance between the back of your bed to the last track? Mine is at around 27in. Loosing 200lbs would mean the hitch is way too far back, not only few inches but 4000lbs on the rear axel is only normal. Consider yourself lucky to be under 4050, I'm sure that most people pulling with Screw 5.5ft bed are overload on the rear axel, even with a 1000lbs pin weight!
No I didn't get the Andersen hitch yet. It was very complicated/expensive to get it here in Canada. I found a used, like new, Reese 15k and I'm quite happy for now.
Curious if you got your anderson hitch yet? Dealer put mine (reese 15,000) back of center and it pulls like a tt. I can drill new holes but don't like that idea. Loaded front axle drops 200 lbs. Have 4000 on rear so it is over. I am under gross of 7050lbs. I noticed the andersen can be used either on a long bed or short just by turning it around. My trailer has a long pin box so I think I can turn it around for a long box and still have safe clearance. I would be tickeled to move 400 to the front maybe even 500. That would bring the rear in line.