OCD would have me moving the axle closer to the center. I have a similar axle under my camper trailer and it works well although it needs shocks to stop it from bouncing offroad and shaking the contents up.
I hear ya....I was concerned too. Although it would have been quite easy to move the axle. I did some testing first. The trailer, unloaded tracks and rides beautifully on the torsion axle. So I filled a 45g and a 30g water tank along with a bunch of lead bars on the trailer and took it for a ride. (About 1000# plus the 700# of the trailer) It tracked and rode fantastic. No drama what so ever. And with the longer axle to ball dimension it is wonderful to back up. I'm hauling it with a 2500 series truck with 3300# payload and class 5 receiver. So tongue weight will never be an issue.
This trailer only has about a 1700# payload rating as the axle is #2500 and the new tires are 1800# each. I'm never going to put more than that in it. My tractor is 800# and implements add another 500#....
I should be good to go......
Plus, if I need to haul anything heavier....A dual axle, fatbed trailer would be fun to build!