Some points:
- FoF usage is not ideal. I cut out the time you were dead, and came to one FoF every ~33 sek. More should be possible.
- You could use your first ToK earlier, so you'd have it ready one more time in the sub-30% phase, which could in combination with a FB increase your DPS by a little, and probably keep you alive better.
- EB was used only two times in a fight of almost 4 min. Probably due to the BL at pull, but I think there should have been a possibility to use it somewhere in between and get some more BoKs out.
- RSK every ~10 sek: I think it's OK, but probably there could have been some casts more.
- Don't know where I can look it up in the logs if you did it or not: You can use Transcendence to teleport back to the boss after the knockback, giving you ~2-3 sek more uptime everytime he uses it. At least that's possible in nh/hc, don't know about mythic.
Those were the things I saw while glancing over your log. There are probably other things, but that's for better players to see / analyze. Probably I just gave bad advice because the boss has something on mythic which reduces melee uptime I don't know (yet).