The build is lackluster, and some talent point changes would make it better, but there's a problem still.
The healing is lackluster. It can't heal enough to forgo a healer in favor of a DPS in raids.
The talent build is still pretty much the same as every other tank, you've just taken few different talents (or not taken some usable ones). Why not go with the proper build, and use your JoL + SoL to feel important?
With the build, you lack any meaningful quick AoE aggro (LDW, Gunship, BPC kinda, LK). Any bigger AoE DPS will suffer more while taking damage due to aggro, and your heals won't keep them up, other healers have to work extra hard.
You also sacrifice good amount of aggro for Seal of Light heals. Which means you need to be fed ToT MD regularly. Losing ToT extra DMG on DPS.
Lifeward is hardly healing. Would recommend getting another enchant.
Even in RDF, it would just be better (and faster) to take DPS talents and items, and clear it with speed, instead of slow self-heals.
Your examples.
VH HC - There's hardly need to heal. One could argue overall healing would be far less, if you had gone with proper build. You know, more DMG and more mitigation, less damage taken as mobs die faster. Don't get your hopes up, Druid heals with HoT's, since there's no significant DMG to be taken in VH, Druid can just use a HoT and AFK and let it run its course.
OS10 0D - You were fighting with Hpala for JoL. Why bother? So your JoL heals could be added to Hpala's, or other way around. Without JoL your healing would've been far less. Your healing wasn't much, and you would've needed less healing, if the boss died quicker, but you opted to do small crumbs of healing instead.
Naxx - JoL carrying heals, yet again. Too bad there's no specified spells to see what exactly healed you and for how much. DK healed 1M, as part of their regular tanking, without sacrificing anything for it.