to me, it looks like you definitely have a wider track width in the rear. disc brake swaps are quick and relatively cheap. if you look into it, they make different depth rotor hats to achieve different hub to hub measurements without narrowing the axle and tubes.
this may get you where you need to be and it may not. the other option is narrowing the axle and tubes. the brake option is bolt on though.
edit: the stance would be damn near perfect if you could get 1/2-3/4" narrower per side. or you could roll the fenders and be done. I've had this issue on OSAC stuff. the other option is rim backspacing, but I like those wheels you've got there.