The Ronovan I appreciate the effort you put into the transitions in the game!
I have a suggestion for further improvement:
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I found myself losing focus on the dialogue due to the pauses between speakers. The constant duration was uncanny, I think, as was the fact that the characters seemed to always have to complete their movement before they could speak.
After a quick-and-dirty find-and-replace of " with dissolve" with " with dis" (using the declaration from the RenPy documentation I linked, above) I found myself dramatically more engaged. Indeed, I stopped double-clicking to skip the transitions to get to the next line of dialogue.
Just a humble suggestion for you to consider, if you haven't already, and my apologies if you're already aware of the technique and decided against it.