Originally Posted by
Thedave
I'd put this slightly differently: "fistweaving is good, even in heroic raids, but you shouldn't do it at an HPS check in a fight."
I'll use Heroic Iron Qon (10 man) as an example of what I mean. For the entirety of Roshak (P1), you should be full-on mistweaving: soothing spam + Uplift spam + TFT optimization. You'll probably need to surging people too. Don't be surprised if you end P1 with 15% mana (if you don't have the legendary meta or a shaman) - it's a straight up healercheck phase.
During Damren (P3), however, there's barely any damage going out and you want to regen mana. Mistweaving would be overkill. This is your phase to fistweave or even less: keep up SZ/TP, autoattack so you get back up to full mana, and prepare for the utter hell about to hit at the transition.
Then the transition to Qon comes. There are now 4 targets, all of which you need to get down as fast as possible (some targets faster than others), but there's also a boatload of damage. Now you have a judgment call. You can choose to (a) full on mistweave to keep up with the damage, or (b) SCK + BoK spam to get a 100k+ cleave going. This choice will largely depend on your 2 other healers: if they can take care of the focused healing required on this transition, you can cleave with no worries and your raid will be in much better shape for it. If they can't, you'll have to mistweave. In this transition, however, your cleave is so powerful at a critical stage of the fight where dps matters the most that you want to do it if you can.
Thus, Heroic Qon is the perfect example where you'll want to do both at different points. That said, this tier has far more DPS checks than HPS checks, so your raid will overall be stronger if you can recognize where you can get away with fistweaving.