Making a board with a wide tail, but still want high performance

whats the best way to make a board with a wider tail say, 14.5 - 15.5 but still enable it to turn well.

whats the best way to make a board with a wider tail say, 14.5 - 15.5 but > still enable it to turn well. Do you have your mind set on a specific tail and fin configuration? If not, you could carve out a wide swallow tail and go with a twinfin setup.