Kirk,
My tire knowledge is now a bit dated but I believe these vehicles have a very simplified setup when compared to modern vehicles. The Caster and Camber are preset and really cannot be adjusted (with some minor exceptions), leaving the toe-in the only real adjustment.
Typically, as you've stated, wear in the middle (or equally on both edges) suggest pressure. Toe-in out of specs should show a feathering across the tread. There should also be some steering issues with that too.
I would have done what you did which is to rotate. I would however suggest lowering the pressure anyways. Depending on what source you use, the suggested pressure is less (my assumption here is most likely stock tires - presumably 4 ply NDT's). Your Traxion tires should have a pressure stamped on the sidewall (I'd also assume the ply count as well) but that pressure IIRC is for a fully loaded tire vs. best ride/running errands or offroading. Are you running inner tubes?
https://www.cj3apage.com/index/Tech_Tips/operation_and_care_manual/Manual%20Part%207.htmQuoted from the 2A manual: 6.00 x 16 = 28-30psi and 7.00 x 15 = 20-21psi.
My SM for 2A thru CJ5 (SM-1002-R6, para Q-13) states for 6.00 x 16 4ply, 26psi front and 28psi rear.
This suggests to me you could lower the pressure some, e.g. 25psi and then observe what the new (rotated) front tires do. The rear tires that are now worn I would definitely lower (again, maybe 25psi) just to allow more edge wear to even out.
Not indicated in your post, what tires did you have and how did they wear? Anything else with the set up different?