So the airport minibus and limousine service counter will close around/after midnight and the "fixed" prices no longer apply? So you will have to negotiate directly with the same drivers that during the day time would have to use the fares set by the limousine counter/agency?
Sorry, for asking but I have only arrived in the day time and had no problems getting my desired transportation.
If true, I agree that asking the hotel to pick you up will be a safe and better choice. But it will not be cheap though...