No reason to run falco SR.
THE build for SR is and will always be A2Ranger3SR3 (for the insane meltis combo), also popular in korea a2QS3SR3 (I dislike QS, but in ktos is super popular couz is a really casual friendly class for solo play, plus gives SR the only thing he totally lack: single target).
Edit: on hacka atm u can play basically whatever u like, since it’s most a casual char before r9 will come out I guess. Even if I don’t like falco as well since the combo he brings will mostly required to unmount, losing those sweet 6k HP that hackapell brings due to the pet