Heya, I really appreciate you actually listening to what I said, instead of splitting hairs and arguing with me! Empathy is such a lovely quality.
To answer your question, I would (did, hihi) drop the 'man'. If you want to remain 'folksy', you could say 'my friend, ...'.
Finally, I agree that it was used endearingly - that's why my comment was pretty milquetoast :)
I recognize I'm asking you to do something 'extra'. I really appreciate it!