What ? Of course it was changed for Warlocks we have gone from 1.18 coefficient to 0.5-0.6 depending of your spec.Blizzard didn't mention any changes for warlocks. They just made the coefficient-fix official and buffed it for fire mages.
So I guess nothing should have changed compared to the weekend and you just had bad luck with your 7% uptime.
In around 20 Twin Consorts H tries both times, I had 25% uptime last week and 13% this week.