Something I always notice is that when singing (harmony) with my husband live - I think we sound OK. The blend seems good, I'm in tune with him - but recorded it's all wrong. The balance is right out.
Funny thing too -- that if I record myself singing harmony with myself -- that doesn't work either. We (the two or three of me) are in tune but it sounds like two, or three, people who have never met or sung together -- and should never, never try it again.
True-Love sounds great singing with himself.
I was born to sing alone I guess.
Cheers, Joy