Hey Buddy,
I use to have that problem then it came to me, speed.
Speed helps alot when trying to pop the board out of the water, also as you press hard down on the back foot, left with the front and sheet in this will give you some power in the sail to get you up.
If you sheet out the noise well rise out of the water and it makes it harder.
Go here to see how Phil does it
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boards.mpora.com]
Have fun mate
sparrow