Or was that a change happening in 5.4? *confused*
I would not glyph DP for this fight tbh (heroic-ly speaking). There's just so much magic damage going on and you don't really need those 20% physical mitigation tbh.
Don't ever take AD together with another cooldown on Lei Shen. Thats just wasted. You literaly can't die after AD brings you back up as there is 0 damage. Just let it proc.
I take only one Decap in P1 since our Monk is the one taunting (extra speed etc.). First Decap I use AD and keep DPSing (Monks aggro is good enough so I dont need to drop RF). I taunt shortly before vengeance drops or my Spark proccs (whichever happens first) and use HA + SW. Usually my Spark proccs around this time. Monk is taking the other 1-2 Decaps (90% reduce ftw.). I try not to use GoAK in P1 since I will need it in the first transition if shit hits the fan. I'm together with a DK on our sector we take all Statics together (its just more consistent). If he happens to get a 2nd Static Shock I need GoAK to survive (HoS on him) - DP has CD from soaking Balls/1st static and I try to save AM for 1st Balllightning Spawn.