u/Delicious-Mark-4199

Hey all! I'm an Affliction Lock who's speccing to shadow destro once I hit my hit goal. I am 1 key away from Kara attunement and I know that Phase 2 is starting soon. I've been focusing on gearing up pre-raid, and so I have been running heroics like SP for badges/Quag's eye, and working on tailoring the Shadoweave set/Spellstrike pants/hood.

My question is: with Phase 2 being just a couple of weeks away, should I start running Gruuls/Mags or should I wait until I hit my pre-raid goal? I've heard the bosses are kind of nerfed and don't want to be too far behind once P2 drops.