Shoutout to
@Hoitado for helping me with the grandmaster.
My pain finally ended when I reached grandmaster at the end of act 6.
Good thing was that I used my 500 hit stored aegon to trash him in about 20 team revives (around 2k units) which I think was quite decent since grandmaster had a quite a bit of RNG.
From the rewards i got a 6 star Rulk and a she Hulk which was pretty cool.
Thank you hoitado