that technique works fine with my GO139 but my flow284 sinks with my weight so i need to get planning asap else i drown
but don't worry, i've been practising a lot on the upwind technique when i was in france. I used the same board as i have and a midget sail (it was blowing 32 knots :d:d:d) and managed just fine if my distance was good enough and if i dared to put more pressure on the side of the board and rely on the sail a bit more then with my Go.
cheers