A kilometre on foil

I have settled for a time on this set up:

 SUP sky wind board

75 cm mast

Standard fuselage 

Naish 1800 front wing and 310 tailwind 

Duotone 4m SLS ALUULA wing with carbon boom, not standard, 3D printed ends on a carbon stick.

..and getting these speeds:

The 1800 front wing is fairly slow, but I don't need more speed.