Water coming of tail is smooth on one board -turbulent on another?

[willi]

I have a 2013 ---12'6 Fanatic Falcon --the glass model --
When I paddle it at speed and look back--- the water coming off the tail is turbulent --not smooth (moving around does not change this)
I shaped a 12'6'' race board with a little wider tail --and at paddling speed the water is smooth coming off the tail -- (even a little rooster tail )
The board I built has a little less rocker on the nose end-- a finer entry-- and a flatter bottom --still does well in chop --soooo

I am in the early stages of building another 12'6'' and wonder --- which is better --- I would think the smooth water off the tail would be better / faster --
what would you strive for -

Conditions -- West Coast Florida -- slop chop up to 2' sometimes with some flat water --

Also, I have heard a roundish bottom is faster than a flat bottom but more tippy

any comments would be appreciated--

Aloha & Happy Holidays

willi ']