I do everything in Excel. I based my rotation on the most important to the least. So getting Immolate ticking, burn both conflags, Incinerate spam until you have to refresh your dot. Obv you will probably save conflag for the slow and use it at an opportune time, but it doesn't really matter when you use it. If you are slowing the team/melee you'll probably be using them right as they come off CD. If I did everything right (which still needs to be looked at): the big numbers come from the
235% sp as damage you receive for your Immolate tick and your Incinerate spam. You can Immolate more then one target correct? So if it was me I'd tab Immolate and then go back to your focus and Incinerate. Keep your conflags to peel melee off yourself or the heals. But anyways you probably already know all that, this is my first time looking at destro seriously lol.
So in-conclusion:
You can't get enough haste for the extra tick of Immolate and the faster cast time doesn't offset the difference the 235% of your sp makes to your dot. (INB4 Bend pulls numbers from the Darkmoon Robe with Haste lol), Crit is the lowest. Stack stamina until you are comfortable. Spell power over all after that.
Edit: I don't play a lock, so real world input is encouraged. These numbers are a raiding approach and an attempt to find a "best stat" to stack.. (haste vs crit vs sp)