Jayce needs a nerf bat, a big one, and here's how

Get rid of the Procing damage on both forms when he goes Ranged/Hammer mode.

Lower the base damage of his Q (Hammer mode)

Make the hit box for his E + Q (Ranged) Combo a bit more clearer so I don't get hit by the hair edge of it.

Get rid of the Max health damage on his E (Hammer) and replace it with Current health.