For the past 9 years I've professionally had my boat shrink-wrapped each winter. But I saw the prices on the white boat tarps and could not believe for about $40 I could get a nice tarp and cover the boat myself. The shrink-wrapping costs me about $250 a year. So my question is...what size tarp are you other 23' t-top cc owners using? I was thinking 15'X25?