When dealing with Strix, it is paramount that you get the jump on him. Try to aim your Net Shot during Heroic Leap, and with Ensnare he'll go down fast. Strix has the lowest walk speed in the game, so even in his stealth he won't be moving too much.

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