Don't add more than the specified amount. Go for a ride and check it several times to get a feel for how the oil level can appear to vary and since you know the amount of oil is correct since you just put it in enjoy the ride.
Mine will vary on short rides but once it is hot and and been ridden it will stabilize and read correctly on the dip stick. I don't worry about the fluctuations because I already know the correct amount is in it and the bike doesn't burn any oil.
A mangy man chasing a cautionary tale
KTM 990R 500EXC