My gold group has a MW healer and we have some very strong gold times. He says the skyreach second boss is the hardest part of the dungeon for him, but we kill it every time so how hard could it really be? Another boss that he seems to have trouble with is Bonemaw in shadowmoon, but he manages to heal it fine also. Here's his youtube channel if you want to see what he does for all of the CMs.
https://www.youtube.com/watch?v=_dp4DQFT99M
As you can see the video is in two parts because he disconnected and the tank (me) died and we still got gold. Anyway, my point is that gold CMs are absolutely possible with a monk healer. So is skyreach second boss.
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This is what CMs are about. Don't mess up mechanics and use CDs intelligently. I agree that monks do seem weaker at single target heals. But if your tank is standing in smashes (or even just one smash) then you won't kill the second boss and your group definitely doesn't have what it takes to get gold. It's that simple. Your group wiping doesn't necessarily have anything to do with monks healing ability. Your tank needs to do absolutely everything possible to avoid damage so your healer can keep the group up, and it sounds like he wasn't. Smash is an easily avoidable mechanic. And if handling the beams is what's causing him to be smashed then dps need to handle them instead. On challenge mode the tank should absolutely avoid the beams imo.
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I'm a prot warrior and we did this pre-buff.
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Also, you can use drums for lust instead. You don't
need a hunter/mage/sham.