FWIW - Hundreds of happy V-Spec owners have set the mid needle to the following position (myself included) and left it alone after that:
Set the mid needle flush with the carb housing. Then turn the needle clockwise until the slot points to 2:00. This is for a stock V-Spec. Speeds have a slightly different setting they seem to like (4:00)
I've played with that needle from noon to 4:00, and it's a very noticeable adjustment.