Here's a small idea you could possibly use in both ESB and ROTJ:

add Boba saying "Friend" after one or some of his lines (like when he's talking to Vader or the guy loading Solo's body onto the Slave 1), along the line of dialogue he had with Luke and Han in the SW:HS cartoon. You know, just a little something to connect it to the fact that they have a history and its part of Boba's character. This would be easy because you could use the audio from the cartoon.

Not a biggie but just an idea - maybe something to tinker with just to see how it sounds.