Ahhh...you have to be very careful when looking at logs, most of the time you have to dig a little deep to find what you are looking for. Most of the peak healing shown for Chimaeron was due to Lightwell use, which is usually the case with a well trained group during a fued. When I looked at the Halfus log here is what I noticed. There was one use of Archangel, with five total smites done. Archangel was popped at 20:20:29.332 and the HPS peaked at 22K. There were two other occasions where his HPS peaked higher, one time at 30K, another at 31K but that was under heroism, but neither were under the influence of Archangel. I'll look at more of the fights later.
There are differences between 10 man normal and 25 man heroic encounters. For example on Halfus, the damage from the very beginning can be extremely high on the entire raid, therefore, I would never see being able to get 5 smites in on that fight, really at any time.
I really appreciate you linking your logs though Mega, thank you very much.