Hey Blutelf, thanks for your input, will definitely try improving my flash-spamming next week and see how I do. And change my beacon too.
@
ElrilArathi: I actually change my talents on an encounter-basis, even though I eventually end up using A LOT more JoL since it can deliver a lot of heal for a little input (lazy mode), plus give a little dps boost to my raid. Moreover, the overhealing is almost non-existant, which I found pretty useful. And finally, I often found myself wasting a lot of AW potential since my healing mates have a pretty aggressive playstyle and we always try to snipe healing when we can, so the benefits of a longer AW is meh... I can totally be wrong, but I actually enjoy a lot the JoL playstyle, and it seems to fit my needs and my raid's.
I may try a different setup next week since I have to try different trinkets (got cake, etraeus, and Helya's bottle, dunno what to use) and use more AW. I'll come back to you with logs if I end up doing it though !