Re: Negative offset
On my Cherokee I had a dilemma like this (had a 68" wide rear axle, and a 62" wide front).
I got reverse cut black steelies from 4wheel parts (15x10) for $50/each. They are literally reverse cut and you'll need a 6" extension to put the lug nuts on due to the depth (in my case, 15x10).
It evened it out just fine, just remember your now leveraging against the bearings significantly harder than before because you have that offset like a wrench twisting on it. It only took me one set of trasher Timken bearings to learn.
'83 Ford Ranger 2.3L 4Spd, Dual Tanks, 195/60R15's, Welded Rear End TOTALLED AT 483,211 MILES