Do not activate the ultimate when Fernando shields up, he will not even get "tickled" when you do so. Try to ultimate him when he just puts down his shield and has under 60% of health.
Don't neglect Corvus's damage, his weapon has about the highest potential DPS in the support class. If he's focused on fighting you, keep mobile to throw off his tracking.
Strix can easly destroy ghroks totem by simply one shoting it , and remove healing 4 enemy that now you can easly harrash ghrokh and others characters that needed that heal
Buck is a mid/good option for dealing with strix, Get illuminate and start searching for him, he can take you out in 3 shots if he can hit you while jumping, be as mobile as you can and use your net to capture him and kill him quickly