This is an interesting thread and well put. I think you sound fine. Not sure if my experience will help but anyway --
In my case my voice is so different in different ranges that if I record myself and sing harmony with myself -- we don't blend at all. Sounds like we've never met and should never sing together. I can blend with other singers just fine.
I choose my keys carefully so as not to meet that stranger within during a performance.
Cheers, Joy