You are not CC Immune when you ult. A smart Torvald can use his Hyper Beam to waste your ult. To counter this, consider Picking up Resilience if you can trust your team to help you deal with Torvald and his team.
Ash becomes Damage Immune but not CC Immune when she uses her ultimate. Your Evil Mojo will make her be unable to knock back/chip at your team, and if she is low HP be unable to be reliably healed as she returns to the HP she had before Evil Mojo
Ash's main strengths are her high HP and her Knockback abilities. Pips Ult can take that away from you for 4 Seconds. If he Picks up Moral Boost, resilience might be a good choice as you normally have high HP and Damage Immunity with her Ult.
If you can see and kill Ying, Prioritize her over her Illusions. Killing Ying makes her Illusions despawn and prevents her from Healing/Shattering. If you can't see Ying and have no/low cauterize killing Illusions might stop healing from her.
Ying is limited to 2 stationary Illusions. If Ying wants to push up she needs to sacrifice illusions to make new ones to heal or her team will need to fall back for healing. Killing her or her Illusions gives no healing for the enemies to retreat to.