I plan to shape a 7'3*19"*2" 3/4 semi gun, pintail. But I wonder what kind of bottom I should make... I will use this semi-gun for an easier paddle in winter (the water is so cold in France in january or february...), for mid waves (2.5m), usually these waves are not glassy. I was thinking about a double concave to Vee: could it be ok? Or perhaps vee in the middle is better? Thanks! Bzh from Brittany, France.