It's just - NV doesn't fit into any of these fights that I can see. That might be due to my raid comp, but so far these are the talents I have gone with for each fight.
My talent choices for each fight (I Use DB, YG, Typhoon, Ursols, and Germ for the other talent choices) :
Kargath: DoC+SoTF
Butcher: HoTW+SoTF
Brackenspore: HoTW+Inc (Still progressing Mythic)
Tectus: HoTW+SoTF (as I explained earlier - DoC might be better here depending on your raid)
Twins: HoTW+SoTF
Ko'ragh: HoTW+SoTF
Imp: DoC+SoTF
To clarify, on fights where there isn't much damage to heal - DoC outperforms NV in every respect. On fights where there is a lot to heal and throughput cool downs are needed - HoTW wins. In almost every case SoTF is better than Inc or Trees. The only time Inc becomes better is when you need an additional 3 min healing CD to use when tranq is on CD (like brackenspore or twins - but again I found SoTF was just better on Twins once we learned the fight)