I actually noticed the slight variation in text to his delivery and thought you did a great job! Writing out inflection can be so hard without breaking the flow but you absolutely killed it.
I love voice acting too but I have such a specific tone in my head when I read that it gives me the weirdest cognitive dissonance when I hear lines said a different way. Or maybe I'm just too picky :p I appreciate all the work that goes into voiced characters though and I can imagine how fun it is when the actors make a character their own! To hear your writing come to life sounds amazing! <3