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Nubie said..If I unhook when planning in footstraps and move sail forward while keep my body weght at same longitudinal position, will board bear off?
Did someone try do this?

It will bear away - but why would you do that?
If you over do it the nose of the board will go down and the rig will overload, so you will probably catapult around the front.
If you want to steer in a straight line when planing we do this with very subtle rig movements and also by foot steering the board.
If you unhook and put the rig forward whilst leaning forwards onto the inner rail then you start a carve gybe.
Note that planing is spelt with one 'n' as it's short for 'aquaplaning'.