Jenos' Void Grip can detect stealth. Even if the enemy Skye/Strix/Sha Lin Disappears S/he can still be void gripped since its basically auto aim. Use this when they try to disappear and Run away
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.
Learn how to bunnyhop and you can hop out when sniping the enemy Sha Lin across the map. It would confuse him seeing you flying up in the air and lunging across the map a pretty far distance. Learn how here: https://youtu.be/2rYToy5eUas?t=315