early planing slalom board

[axel07]

Hi Kevin,
i've just sold my ft138 (grrrrr, no coment!) and bought carve 111. I allso have Kombat 117, But i find a probleme for early planing on lightwinds now!
I do not like to use bigger sails than 7.8 m2 (i find it to heavy) and prefere no cambers.
To use within 14nds+ to 20nds + aprox, what board do you think is better for early planing on flat water? stype 137 or isonic 133? I know isonic might be better for bigger sails, but what do you thing about st137? Thanks in advance.
Axel