AoE: Skorpyon
Not sure but probably AoE: Tichondrius, Aluriel, Botanist
Single Target: Chronomatic Anomaly, Trilliax, Krosus, Etreaus, Elisande, Gul'Dan
Botanist id call a control fight, we cleave components, but far from what i consider AOE, since it is more about controlling the fight than bursting it down. Chronomatic Anomaly, is another cleave fight since we dont pay direct attention to the adds, but just cleave them down, it might turn to ST with Focused AOE on mythic, but thus far i consider it ST with a bit of cleave. Other than these two fights i agree with you, Tichondrius is AOE packed, same goes for Aluriel, and the rest is ST throughout.
I don't know your trinket, and i my self run with 4-5 trinkets i swap between depending on the fight im about to face. First being my most "standard" trinket, i run it on pretty much every fight being ST or AOE, its the Horrorslime 895 with a socket on it, being superior to anything else that i've gotten. My second trinket, which i use 80% of the time is a statstick 860 ilvl, with crit on, so nothing big but it out performs 90% of the trinkets, so it's fairly decent.
Situationally i use Eye of skovald (heavy AOE (skorpyron)), Bough of Corruption (not used it this raid tier yet), and Plaguehive which is used on fights where i need the extra haste over crit, which honestly is not very often i used it on Krosus, and it did fairly okay, but whether it out performs a stat stick i dunno.
So yea my answer to you is drop the Aran on every single fight but Skorpyron, and get yourself a statstick or two, since they seem to kick ass now, my self im looking to find that one shiny one with ilvl 895 or higher if its posible with the increased titanforged ilvl in NH being 925.
But GL