I think you also might be pushing it a bit.
There are no Taxi,s at Samui airport only mini buss,s and not everybody will be in as much of a hurry as you and want to stand around taking photo,s ect and the mini bus,s wait until they have enough people b4 they head off.
Even with a private pick up of 400bht from the airport may not get you there fast enough.
It took us a good hour from getting off the plane until we got to our hotel in Bophut the other week with private pick up and at night!
I think get a later ferry and your own transport on Phangan and take the pressure of a bit.
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