Maybe it's the way you define it?

What do you mean by 'gravitational potential negative energy'?

And are you thinking of it in mathematical terms or physical. To me all transformations involve 'energy, assuming this it then stands to reason that annihilation, as a anti particle meeting a particle, should leave a energy conserved, even inside a black hole?

=

And that is the imbalance I was referring too, somewhat like a Black Hole losing 'matter', but building up 'energy' as it annihilate by Hawking radiation inside the Event Horizon-