This is how I understand it, someone correct me if I'm wrong.
'05 didn't have reverse and had a small case due to no reverse
07 had mechanical reverse which made the case bigger needing more fluid
09-10 has electric reverse which did away with the mechanical gears but they didn't resize the case which means more fluid than 09 due to the loss of reverse gears
07' cases also take 12oz. biggest problem i see with overfilling is the extra oil will likely leak out the groove in the bolt that holds the secondary on for venting the case, which ends up on the clutches= day ruined...