SUP? for windsurfing

[wind vain]

hey all, i bought a starboard ultimate blend in hopes that i could use it for windsurfing after the wind has dropped below what i can go on my 105l board. and still be able to catch some rides on what passes for waves here.:o

today was one of those days, was on my 6.2, wind dropped enough that i was still planing, barely.. so i popped the sail on the SUP, felt like loads of power, but could never get it at plane at all, except while in a breaking wave.
so is this normal?
is it possible to get these to plane just on sail power?

and any tips on getting upwind?
ive already put a larger wave fin in, i can stay even, but am having a really hard time getting upwind far enough to be able to get on the wave far enough upwind.
already considered the wind had gotten too light, so i took the smaller board back out again, and was still able to plane.

[Helmer]

I have tried diffenerent SUPs along the Dansih coast (Onshore to Side shore conditions) and Flat water fjords.
I find it best to use the rails, i.e. stay close to the mastfoot, press with your heels on the rail. This gets me upwind.
Getting planing on the SUP needs almost the same or more wind as getting planning on my 102 L board.
I find the SUP most fun in waves and sub planing wind conditions when the alternative used to be going home or staying on the beach.

[wind vain]

thanks Lars, i had another go on it today, 8-12knots, 6.2m wavesail, was no way that it was going to plane. had a bit better luck going upwind, caught a few waves, good workout, but i gotta say im a quite dissapointed in the planing performance. i know its not the most efficient windsurfing design, but i thought based on its size it would have to plane earlier than my 105l.. but at least i can still go float around on it.. and try to catch some waves.