Destro sims higher for me too, but I'm not entirely sure I trust the new SimC yet. It got me curious enough to actually
try Destro though and I found that I do more actual DPS when I tried Destro in limited action. I'll be doing further playing in the spec this week to see if it's true when done throughout everything I do.
The difference between using my Affli set up for Destro was smaller then using my Destro set-up for Affli, so (for now) I stuck with my Affli set-up so I can easily switch between the 2 and properly test this week.
Best advice anyone can give you is to give it a shot and try playing as Destro to see if your results are indeed better. There's just too many variables and unknowns at the moment to know if we can trust our theorycrafting and Simming. In those cases you go to the most reliable way to test things: you actually go do them and check the results you get.