BiB is suggesting gear/soulbind changes that show a dps decrease.
Snapshot: f2a06e3e2acb40179662e59bb972ca36
My first observation is this:
Your primary optimisation is being made for your Protection set.
If you want to prioritise Arms, I would suggest moving Arms to the top of that list - just drag it to the top - & get that ‘sweetened’ the way you like it.
I got this:
If, however, this isn’t what you meant, can you add any additional information that may help (esp. those better equipped to deal with these issues than I am) towards a resolution?
Good luck.