Concave...... too much?

Someone told me one of my boards has multitudes too much concave, and will act like a plow in the water.
The boards a CC Rider 9.2 X 18 3/4 X 23 X 15 X 3
If you measure down from the nose:
6" has 1/8"
12" has 1/4"
18" has 5/16"
24" has 3/8"
30" has 5/16"
36" has 3/16
40 on down to the tail is flat.
The cut is like a spoon shape.
Wondering what y'alls opinion is on this.

The boards a CC Rider 9.2 X 18 3/4 X 23 X 15 X 3
If you measure down from the nose:
6" has 1/8"
12" has 1/4"
18" has 5/16"
24" has 3/8"
30" has 5/16"
36" has 3/16
40 on down to the tail is flat.
The cut is like a spoon shape.
Wondering what y'alls opinion is on this.
