Early planning alternatives for light weight sailors

[Han]

Hi Roger,

myself and other friends have a discussion about alternatives to Formula for light wind windsurfing for light weight sailors. (<75kg, <165lbs)
There are opinions, which say that using slalom/freerace wide boards, 75/80 cm, and smaller sails than formula, 8.0/8.5, will give the same early planning threshold as formula gear gives. (7/8 knots)
What do you think about?

Thanks!