Buy haven, even that 7% reduction on all shots may mean that strix must take 3 shots at you instead of 2. This is massive since you have way more time to attack him. Buy nimble since it increases your movement speed making it easier to strafe.
Strix invisibility is good and gives him advance agnist any flankers trying to kill him but if you are playing as flanker take illuminate and take care of him easly when he cant hide from you