If you don't like what your tools are telling you to gear for, take it up with the math involved
I am having some serious personal gear choice issues as far as the set bonuses go. I am having a hard time giving up certain pieces to make bonuses. For instance, I have the gloves and the shoulders, but after using them for a week of raiding I felt that I did worse. I decided to break the bonus and put Poison Protocol shoulders back on. After reforging it gave me the same base agility but with an increase to mastery about 200 points.
Now I have the tier helm and I'm thinking after I get the chest or legs, that I will dawn all this equipment for the 4 piece bonus. My question is, are the bonuses together worth losing a whole lot of mastery? Or should the helm be my off piece? I have the spreadsheet, I've read every forum on here, but losing all that mastery is a hard pill to swallow. Some advice concerning this would be very helpful. Mind you, this is all concerning non-heroic gear, as my guild is just beginning to tackle heroics.