I had no idea that was how it had been done.  Oi.

Well, I put the gens model into Silo and made a larger UV map (4000x4000) before applying and tweaking the textures a little bit more in PS before applying the updated maps to the prop.  Combined with working on the base torso/hip area to help even things out, I seem to have gotten a pretty good fix.  The stretched uv's are still there, but not nearly as bad with the larger maps.