Fallen, you said you have tested many specs extensively and I was wondering how UA/Ruin build came out. I am thinking something along the lines of :
WorldofWarcraft.com -> Info -> Classes -> Warlock -> Talent Calculator
Key talents being 3/3 Pandemic, Eradication, and Malediction, and using Spellstone.
It would be a fairly easy rotation to maintain, CoE, maintain UA and Corruption and maximize Shadow Bolt casts. I believe that even if it came up a small percentage short of a straight destro build (which is what I usually raid with), the overall flexibility of the spec will be very handy.
Your thoughts from testing?