Hey,
On garothi ur rotation actually looks pretty good, but you have SO MUCH downtime. One of the biggest things to dps is to always be casting. I know there are some soaks out of boss range but youre not doing anything for what feels like 1/5th of the fight. Have a look at this timeline:
https://www.warcraftlogs.com/reports/6X ... w=timeline
There are times where you dont attack the boss for over 10 seconds which is an insane dps loss. If you fix that youre looking at some solid dps. Also if there is no time to use a 2nd hero due to when your group uses hero, youre better off using another legendary, like sephuz for the extra 2% haste or the helmet.
On felhounds you seem very uncomfortable with the movement from the fire. The fire only spawns after a sec or 2, so you can finish the frostbolt np, again you have lots of downtime.
on AHC, you use sephuz but only proc it 7 times, even tho you can have 3 heroisms in that fight since it lasts longer than 5min. You hero on pull, ask the sham to lust on your 2nd IV (on 2nd boss with the adds) and your own hero will be ready with your 4th IV (or delay 3rd depending on fight length, if you only get 3 anyway).
Again you have way too much downtime on this boss even tho you never went into the pod, that's costing you so much dps.
On imonar, since ur only getting 3 IV off anyway, just use it on p1, p3 and p5 so you can have it from the start and lines up with the hero usage. You used it right be4 transistioning which is pretty pointless. Also dps on this boss is heavily reliable on how quick your guild crosses and dispells sleeps. Again your rotation looks pretty decent here, apart from some cancelled casts or sometimes half a second between frostbolts, but your cd usage completly screws your dps over.
Overal, your rotation looks fine, sure there can be some little things that could be better, but the main thing between all your pulls is that you have waaaay too much downtime on your casts. You neeed to be able to do your rotation while doing mechanics at the same time, if you can only do one of them at a time ur dps is suffering A LOT.
Good luck!
.