If Fernando doesn't have his shield up, try to hit him with your spit (don't detonate it). After it hits, you do more damage to him with your rockets, taking him down faster.

Save your Fireball when Seris is healing her tank. Combining that with Cauterize on your flamethrower, your tank will get healed less, so he will require more healing attention, as such, reducing the survivability of their tank and other teammates.

Ruckus with Wrecker can literally melt your shield! Formidable might be a good alternative to Aegis, since it gives you healing when your shield is abscent, but only once every 40 seconds, so enter the fight at the right time!

When Torvald ULTs, you can use Pounce to reverse the knockback, saving you from falling into the pit and gain a ridiculous speed needed to get back to safety.