Mercy IS the problem

Incidentally, how about this?

GENERAL

All damage boosts do not increase headshot damage.

MERCY

Caduceus Staff (Healing Rune)

  • When a healed teammate is on/near the ground a small glowing circle appears below them, providing an additional +10hps. For a combined 65hps.

Valkyrie (Ability)

  • No chain beam
  • 60hps beam
  • Healing Rune increased to 30hps, and increased in size to be 10m radius, and provide AOE heals.
  • 4sec duration, 20sec cooldown
  • No beam breakage during cast.
  • Near instant weapon swap speed between staff and blaster

Resurrection (Ultimate)

  • Single target, instant cast.
  • Brings the player back at half health.
  • Reduce the Ult charge cost appropriately.