There is no concave on my square nosed Speeeds.... but I like it on the pointy one!
My original 8'11 Hobie RAW had a
very pronounce concave under the nose....
I felt like it gave lift and stabilized the nose as I weighed forward, while paddling into a wave.
It was one of my favorite features... it was fun to noseride as well.
I straightened and added a reference line to your picture.... from that distance and angle it
is hard to see, but the line helps define it.
Thanks for ordering that.... looks like a good customization!