It could be sadism in its classical form..

There is more to the behavior of ASPD than wanting to watch people suffer whilst feeling euphoric during it. Technically; this whole explanation would not justify your (in)accurate diagnosis.

When I was diagnosed, the doc (who discontinued our sessions) knew on the first session I was your casual ASPD - a compulsive liar and a typical manipulator.. he even recommended that I don't see professionals in case they unintentionally teach me something that will help enhance my manipulation.

You claim you can be extremely empathetic when you want to,
you see, ASPD cannot do that; they don't have the capability of switching the ON button for empathy.

I think what you need to distinguish with your doc is whether the diagnosis was accurate or an accidental/careless misdiagnosis.

I'm not sure if this exists but maybe you could have: BPD w/ antisocial traits? I don't know.