Issues I can see.
HFA
https://www.warcraftlogs.com/reports/yK ... 4&source=5" target="_blank
Strangely this is one of the only fights you went PC for despite AO actually being decent on add fights.
1x PC
0x AP
1x Evo
In a 6 minute fight. Do you DC or something? You're sat on 100% mana for 3 minutes.
Reaver
https://www.warcraftlogs.com/reports/yK ... w=timeline" target="_blank
You've used AP way too late. The ring has already exploded and your int pot has expired.
Your mana regularly either caps or dips far lower than expected if you were using the 93% rule, and doesn't recover. This will consistently hurt your DPS due to how your mastery works.
Kormrok you're dead for most of it, but should be using Supernova for hands.
Kilrogg
https://www.warcraftlogs.com/reports/yK ... &spell=100" target="_blank
You use Evo at 0:20 but something happens and it gets cancelled leaving your mana in a mess. There's no casts of last tier spells before dying again.
Gorefiend
No AP on opener. You've got enough time to use everything on opener and have it ready for feast. Die again.
Generally you need to learn to rotate better because you dip around the 75% mana mark a lot, and rarely recover it properly. I assume you've read guides, if not find the arcane mage guide in the forums by Dutch it'll help a lot.
If you've made a mistake, especially an Evo one, you need to get really conservative otherwise your mana pretty much never recovers. ABx2, any AM, Barrage until it's back to normal.
You need to get something to remind you with CD's. Tellmewhen some weak aura or the likes so that you use them regularly. You miss the use a lot.
You kinda need to die less. You're playing one of the most surviveable classes in PvE. Start learning to use Alter Time and GI. There isn't a single cast of either in the entire night. GI is a perfect oh shit talent on a low CD to save your ass from almost everything in HFC.
Ice Floes usage is really low. This talent is so essential to countering arcane mobility issues.
Also AMR is totally wrong about trinket selection. Don't know if that's to do with class trinket having no intellect on it or whatever, as it always picks PoF and UGoS, but definitely equip it.