To start things off, I am mainspec shadow but, as of late, been offspec healing (holy) a lot of our raids due to attendance (so forgive me if i'm way off the mark here)
I initially started healing without archangel and was doing just fine (we have two druids for innervates when needed and I was getting much better at mana conservation). That said, I wanted to try out using archangel thinking that it might help both with some output and mana regen so the innervates could be used on other healers if need be and not have to rely on them. However, the first night of raiding, I found myself struggling to find good niches to fit in smites and even let chakra fall off becuase I was not used to watching for new timers to try and keep up my stacks (that's more of an issue where I was not used to the different play style). During the course of a boss encounter, I found myself only being able to "safetly" use my fully charged archangel 3-4 times at most because I could not afford to stop healing to throw away the cds.
My question is the following. Would it be better to just drop archangel and put points into imp fiend for the 1minute cd reduction? If the lost healing output (due to smites/inner fire to build stacks) is offset by the bonus healing% that archangel gives, the only real benefit over the mana regen component would be slightly higher burst healing for a short duration. So if that balences out, would it not be better to pop fiend early and get a second cast of it later in the boss fight and not worry about keeping stacks/archangel up at all?
Also, I have no experience doing hardmodes yet so I'm not sure if there would be a big difference in spec utility.