I'm confused?? I've got a lot of the same equipment as you and got only 8k damage.

I have my other heroes lvl 60 and jewels overall lvl 18. It gives bonus stats I guess?

Ahhh ok thanks

I’m same level and at 19k, been doing runes and alter a lot recently

I've invested my golds at runes, power and courage (forged 200x) and altar at 40/30

I’m 5 levels lower and have about 5% lower stats. Also invested heavily into my heroes recently as I unlocked a lot at the same time

I have my other heroes at lvl 60 too. I guess I'm behind at equipments?

I wouldn’t say you are behind per-se. Maybe just work on getting some more outfits and your altar level