Your weapon and skills desynergize. I personally never like fury because that damage easily changes life and death, even if you "get into desperation range" you still need to engage and that can be risky. Ideally if you want a desperation effect you'd build towards:

Wind Parthia

Moonbow or Ruptured sky for arena points

Swift Sparrow 3 or atk/spd solo 4

Dive Bomb

Spd/def rein or if heavy blade seal atk/spd rein works equally or better

Swift sparrow, if you're going for the spd/def reign and heavy blade can work with either atk/spd or spd/def. This will allow you to double consistently and if you do drop some hp, WP can get you back into dive bomb range.

If you prefer a mixed phase unit:

WP

Moonbow or Ruptured

Close counter or foil

Guard, or flier formation/ aerobatics to make him more mobile and allow him to block for units or fly in and pick targets

Spd/atk rein to maximize defenses

Iotes Shield or a bond skill

Close counter secures combat either phase and the mobility if formation/ aerobatics help offensive attacks or with guard to help stop units to special kill him on retaliation. Iotes maybe more preferable to stop arrows from killing him but a bond can certainly do work combined with the aerobatics or aero.