I'm not one to Necrobump, but I've just started looking at the stat rolls for Raid gear and every piece of each type has different stats and perks. I'm putting together a web-safe list of current holdings but in essence, keep raiding and each drop has the high potential to be a different roll.
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I have actually been pretty lucky in getting the perks I want with my raid gear and yes the only answer, at this point in time, is to just keep raiding and eventually you will get what you want. I save a lot of my extra gear and level it up just in case it makes for a better balance of Intellect, Discipline, and Strength for when I switch the exotic slot around.