i'm just tired of female characters often being wimpy when it comes to the super strength department or being an inferior clone of their male counterpart. Starfire is the only decent one, and shes only good in the animated version of teen titans. the crappy comic book one is just... eurgh. Thats why that little seems too low. But that wont be bad if she can lift more and more, unlike Superman who has plateued. I'd be ok with that.

Though if you hate the void energy thing, that sorta ties most of her powers together minus Super strength/super regen, which are standard powers. I'd need an energy type that siphons then, besides magic. (God I hate the spell Magic Missile, so bland.)

I should also point out that 500 lbs isn't that super strong. Deadpool can lift 4 kilos before his body will stop lifting things due to his bones snapping, and batman can lift 500 easy.