Twisting corridors will be a lot harder because of the torment debuffs. Soulforge debuff isloose 1% HP every 5 seconds and it stacks with every floor and higher layers start with a higher stacks. On Layer 8 I think you start with 4 stacks on floor 1 so once you get to the boss on floor 6 you'll loose 10% HP every 5 seconds. I don't know if the stacks start new after 6 floors or only the debuff changes but with the scaling from floor to floor mobs gain a lot of HP and damage.
Normal Torghast was a joke on beta and twisting corridors was actually hard. On live now after they buffed (+40% HP and damage) and nerfed (-26% HP) Torghast, it's harder than normal Torghast was on beta so I would imagine that twisting corridors will actually be a challenge.