i am about your weight, and sail often in light winds
< 12 knots is longboard weather for me
12-15 knots is JP SLW weather
15-20 knots is board like the Mistral Vision 161 or less
have tried an AHD FF 160 with 10 meter sail, but did NOT like it when the wind dropped - sail became too heavy
that is why i went to a Mistral Equipe 2 XR in light winds with 8 meter sails
when winds are a little more stable i do enjoy the 10 meter sail
as far as the Mistral Vision 161 goes, it seems it was\is 70 cm wide
this may be narrow by today's standards, but slices through the water better in light winds and in chop
all depends on your skills - as Stehsegler suggests - can you handle 70 cm wide board or need more ??
also, Geoff aka gh seabreezer seems to have had one and used it in light wind
pm him ??
and looks like the board is not just light wind - due to 70 cm width I guess (video is in more than 14-17 knots)