No. Grass collecting on the foils will not cause a pitchpole because an accumulation will cause the foils to lose their ability to fly and the boat simply will come back to the water very slowly. While flying I don't seem to have the grass problem because hitting it and moving at 25mph in Biscayne Bay causes enough action to keep the foils clear.

If sailing backwards for a few feet doesn't clear the stuff it's a real pain. You have to come up into the wind, raise the three foils from their position extended 4' down into the water and walk out on the beam to reach down and clean the stuff off each foil and the rudder, as well. The boat is 17' wide and it takes a little while to reach all the spots. While single handing it's a heads-up operation and "one hand for the boat" doesn't make it an easy chore.

In the Conch Cup I think I cleared grass only three or four times. I was too lazy to do it more often.