Is it just uptime or something else

[honest hearth]

So im playing warrior for my guild to give shout but once we pull mythic my dps tanks way harder then I've ever seen.
https://www.warcraftlogs.com/reports/Jz41kgFDHvq3PTVA?fight=2&type=damage-done&source=29
This is a heroic mugzee I did and then these are our mythic mugzee attempts

https://www.warcraftlogs.com/reports/FwYGjvcPNJLhRAZ7?type=damage-done&source=67&fight=113

[gentle pulsar]

Press mortal strike more often, there are lots of 10s gaps where you are pressing lower priority skills

Not sure why you are rending so much, you casted it 35 times throughout the fight for no benefit