You could gently smoothen (is that a word?) the edge of the seattube where the post enters it, but some scratching is unavoidable on a seatpost.
If you want to keep it nice and shiny, set your seat too high at first and lower it at small increments until you reach your desired height. (Measuring a previous bike, taking saddle, crank and pedal characteristics into account helps here). You will be uncomfortable as hell on a new bike with a high saddle, but that's what you get for being so picky. You could do the "pilot phase" with another post you may have lying around.
All that supposing the post is the right size for the frame, of course. You may gently pry the "flaps" apart if they seem too close together.