I don't understand this whole argument of fistweaving totaltotemic started (and derailed the thread might i add).
To address the OP, your MW is fine and he's not doing anything wrong. Fistweaving isn't required and in many cases (from a 25 man standpoint, I understand it's different in 10) is actually far worse than mistweaving. If anything you need to be having a talk with your priest. I don't understand why he/she would think playing disc on malkorok is good, holy out performs disc by a looooooooong mile on that fight.
When my guild (again, 25 man) can't meet a dps check and they're off by maybe a good 1-2%, my guild/raid leaders don't tell me as a monk to get into melee and fistweave so we can make that damage up. They don't tell our Disc priest that she needs to smite harder, they tell the dps that they need to pick it up a notch. You play a dps class to dps, a tank class to tank, and a healing class to heal. Requiring your healers to dps because your dps classes aren't performing as well as they can is stupid. The only time that I could see that being viable would be in the world first race, which I doubt anybody here is in or has been in.
Since totaltotemic brought up that 25 man monks need to be fistweaving I'll address that as well. From my experience fistweaving is absolutely abysmal, and pure garbage in 25 man. The healing you do is nonexistent, and the damage you do is unnoticeable and chances are you won't make much of a difference on the fight. Since you mentioned Garrosh, while we were progressing and failing to meet the dps checks, I never once heard anybody in my guild say "our healers need to start putting out some damage so we can push this over". Instead, what I heard was "hey dps, we need to pick it up a little so we can push this over, save your CDs for x, y, and z moments and use your second pot here".
The only point in time that fistweaving was basically a requirement was in 25man Heroic T14 (it was crap in 10 man back then, idk what the case was in 10 man for T15 however). I personally prefer that playstyle and wish we could go back to being that potent. Another thing to keep in mind is that the fights in SoO aren't designed for mistweavers to shine. The only fights that they really stand out in is (in 25 man) Malkorok, Blackfuse, and Norushen.