Glad to be of help, though that was a mistake on my part having .whoAmI instead of .owner.I apologize, I was mistaken. While you are still a great person, I was wrong that it was working. It was simply providing the HealEffect, which is the green number. I wasn't actually being healed at all. Still, it's a step in the right direction. Any more advice?
It's been a while since I dealt with healing players, and I'd forgotten that the heal effect and actual healing is seperate. Like you had earlier, you need to add lifeSteal to the player's health, but add it to Main.player[projectile.owner].statLife instead.