Hmmm, lvl 13 LoH seems a little over-heal, I'd get +2 prayer in its stead, mostly because having +2 does more for prayer than it does for LoH due to the range increase. It depends entirely on how often you use prayer though (a lot in my case). In regards to the healing passive, I think you should skip on it "IF" the healing formula remains the same. If you're suspicion of lower heals is true, then 13 LoH and the passive might be useful...
HS is nice in myth mostly because it has a low cooldown. It hits 5-6 times on bosses and around the same on mobs, so its good for 10 seconds of cooling.
I was about to ask about Wave, but I saw the note at the bottom xD.
Aurum211: Myth Healer 7th RB (350% exp rate RAWR)
Gummygumdrop: Myth Lime 4th RB (on leave for now...)
Mabinogi IGN: Zinc210: total lvl 7xx