You are using AoE talents on your Loomithar & Fractillus kills, most people will check these pure ST fights as most problems are easily identifiable here.
Enrage uptime could use a lot of work on all of your pulls, there is nothing stopping you from having 95-99% on all of these if utilizing your toolkit correctly and knowing the mechanics.
Naazindhri Enrage uptime - 87.9%
Loomithar Enrage uptime - 91.6%
Forgeweaver Enrage uptime - 85.2%
Soul Hunters Enrage uptime - 75.7%
Fractillus Enrage uptime - 89.2%
Nexus King Enrage uptime - 70.4%
It looks like alot of your issues other than Enrage uptime is not casting Raging Blow enough and casting Rampage too early, this coincides with not making full use of your Bladestorm windows as you are not spamming RB afterwards to take full advantage of Slaughtering Strikes/Brutal Finish.