i think the early planing question has been answered
there are other much more critical factorswill you drop the sail ?? if so, when luff fills with water can you water start or uphaul
when I am tired I cannot

if the wind is steady - why bother with cambers at all ??
i used to be an advocate of cambers over say 8.0 m²
now I have gone to a Mistral Equipe II XR carbon with a HotSailsMaui SpeedFreak 8.5
glides magnificently in light winds and has fantastic range - board and sail
also have a JP SLW92 since I am heavyweight
buddy has an Ezzy Lion 9.5 on same board and loves it
it has 2 cambers and thus is "freerace"
i use a MauiSails TR-4 10.0 m² race sail on mine
for me it works great because i need to get through the lulls in 12 knot winds
however, I hate uphauling it and cannot water start it - beach start no problem
one thing i LOVE about wide luff = NO crinkles
mast slides right up the luff
HATE rigging narrow sleeve freerace sails with cambers
there are VERY good freeride sails now - for regular windsurfers - why camber at all ??
SailWorks Retro is a prime example