We can see your character name, server, etc. to the left of your post. Don't sign it at the bottom as well.
in going between 2.2.0-beta 5 and 2.2.0-beta 6 gave some odd results from the optimizer in terms of gear selection.
If I went and simmed them the beta 5 suggestion gave me better potential dps than the beta 6 suggestions.
I noticed that beta 6 had a much lower spell hit in it's optimization than beta 5.
What I would do (before I noticed that the export ignored selected buffs), was select all the buffs I would actually have in my 10-man. Optimize. Turn off all those buffs and export to EnhSim. I would re-enable all those buffs in EnhSim and do a 20k hour simulation, then compare the results.
What can I provide that would best assist you in determining if there's a bug here, or just a difference in mechanics (say for example that beta 6 is looking more at 3.1 where beta 5/EnhSim was looking at 3.0) I could provide my rawr.xml files and equivalent EnhSim config files.