Surface loft and boundary

Hello,

I am trying to model a kitesurf fin using the surface feature and I have a few issues:

1./ When I apply the loft feature on on the profile, it doesn't include the two parts on the extremities. Is it normal?

2./ When I check carefully the loft surface doesn't follow properly the guide curve on the side (some small spaces remained unfilled). Why and how to solve this ?

3./ Considering loft doesn't close fully the surface, I try to use the boundary surface feature to complement the loft done and closing it on the extremity but I don't success to make this properly. How to do it ?

Thanks in advance for your answer.

SolidworksSurfacing