fyi
Auto Attacks start queueing about the last 1/4th of a cast.
If you just continually cast every GCD, every 5-6 casts you'll see an auto attack netting 5-6 DPS.
Along with that, auto attacks CAN go off during the cast, in that last 1/4th or so.
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I was waiting to see if this is what you meant. I use M2 instead of Ruin because of the instance cast (I pretty much only use my SCH for end-game high movement content) and I use M2 instead of Ruin2 for constant damage because I don't like to Blind the mob when it isn't needed.