One thing that keeps happening though is the nose of the board will lurch off down wind and I end up being thrown off the front of the board. This mostly ends up with me in the water trying to breathe with water blocking most of my air ways!
I also have another question, I hope you don't mind sorry to keep asking.
So far when riding my new board I have been using my waist harness but I have noticed some of the top racers using a seat harness. Is this a personal preference thing? I have seat harness that I had from when I was learning, is it worth giving it a dust off?
" the board will lurch off down wind and I end up being thrown off the front of the board."
Does this happen on the downwind or upwind?
If this is happening on the upwind it is a sign that your fins are too big for the conditions. You are getting too much lift from the front fins and the board gets to high off the water. Then the fins loose traction and the nose drifts downwind and you crash.
Look at this video https://vimeo.com/gunnarbiniasch/questforvmg#t=88
at 1:28 m. Is this what is happening?
If this is happening to you on the downwind, it could be that your weight is too far forward, and again your fins might be too big/lifty for the conditions.