I have a MY2006, OEM suspension and wheels and this car is my DD. Recently bought new rears and after installation the steering wheel was off center. Took it to get 4 wheel alignment.

All specs after this alignment were within OEM ranges, however the car still drifted right.

I took the car back today to get it looked at and they set the left rear toe out. The car still seems to drift right. What are my next steps? I fear something is wrong with the suspension. If I leave it as it is, is my car going to be twitchy at high speeds and is that left rear tire going to get chewed up?

Here are my numbers:

Front left:
Camber: -0.6 deg
Caster: 6.0 deg
Toe: -0.02 deg

Front right:
Camber: -0.6 deg
Caster: 5.9 deg
Toe: 0.01 deg

Total front toe: -0.01 deg
Steer ahead: -0.01 deg

Rear left:
Camber: -1.9 deg
Toe: -0.07 deg

Rear right:
Camber: -1.4 deg
Toe: 0.12 deg

Total rear toe: 0.04 deg
Thrust angle: -0.10 deg

 

I would tell the guys to even the rear toe. It could be bushings too that will come into play. Or a bent arm if you ever been in an accident. But if camber settings are accurate, then it shouldn't be an issue with tire wear.
It could also be a tire defect as well. I would inspect all bushings and adjust camber before going on from there.
Working at a tire shop, I've seen defected tires that caused alginment/driving issues.