I've already checked the logs of mages in your guild. Idk why you are trying to whip out an ego. If skill is an issue clearly kindling would be better anyways because you won't have to worry about CiS openers and positioning it in the first place. To the OP, run conflagration, living Bomb and kindling in mythic plus. In progress raid, if you aren't playing correctly I would suggest going pyro unstable magic and staying kindling.
Edit: Here are our logs for heroic ursoc: (choloz is jurrbs) his-
https://www.warcraftlogs.com/reports...bCw1V#fight=18
(I am Crispycast) mine-
https://www.warcraftlogs.com/reports...JdvPHL#fight=9. Despite being only one item level higher, I did 40k more dps.