Try to separate him from his turrets and wait out his shield because of the short duration of the shield. Do not let him be first on point and set up turrets.
If Pip is pressured, you might force him to use his Healing Potion on himself to survive or if he's playing selfishly. Cauterize helps alot in countering him.
Bulldozer will be your best friend. Anything that cripples as she get low on HP is almost necessary. CC reduction is also gonna be a big difference. Take out her foxes first enemies second, her healing is very solid so focus on her not the tank.