Ya'll need to get better co-tanks!
I tank with a BrM, and we both parse highly so it's not like either of us are slacking really. I agree that RF is a wasted GCD; what I usually do when he has to/does taunt is 1st refresh SS (to preserve vengeance levels) on myself or him, then 2nd salv (if needed), and finally bank up 5 HoPo.
This does 3 things: Keeps a good sized SS rolling on someone, gives 2-4 zero-to-low threat GCDs for him to LOLKEGSMASH (broken ass threat), and gets me to a full tank of HoPo to play off of for when the swap comes back to me.
That, or just 1 tank damn near everything, and problem is also solved.