Number One Uh ... don't lower the car like a teen gangsta.
Does he have stretched tires on wides too ?
I will say I am surprised they couldn't get toe correct. There is a lot of unused threads on those tierod ends
You don't know how much he lowered his car...I have lowered several, and often just an inch or two will require additional suspension mods to bring it in spec.
Also, he said this is the rear...so probably not ANY threads on a tie-rod...as it is most likely fixed.
I think the OP made the best decision. Several of my smaller Euro cars have a ton of rear camber, and just a slight amount of toe to keep it stable. I would do the same on his setup. He might see a little faster wear on the rears...just keep them rotated.