How recent was the job change? My experience is that if you wait at the left turn a few times, waze does learn that the turn is slow and stops routing that way where there are better alternatives.
Also be aware that the highways have had lots more attention from the editors than the residential streets in most areas, so it is usually beneficial to check the edit map for errors where you are getting strange routing.
Regional Coordinator: Mid-Altantic, US
Verizon, Droid Razr Maxx HD, Android 4.1.2, Waze 126.96.36.199