A single Shoggoth has 400hp, regenerates 50hp per round, a melee skill of 10, and it has 10 bash armor and 30 cut armor ; It also does 7d5+6 damage, so 13 - 41. They also multiply with biomass…
Compare that to a Zombie Hulk with 480hp, no regeneration, a melee skill of 5, 8 bash armor and 12 cut armor and 4d8 damage, aka 4 - 32.
So, in total, even a hulk would only survive…probably around 20-30 rounds against a shoggoth, while the hulk can’t even hurt the Shoggoth…
Why do you have the remnants of humanity so much? 