I just bought my first longboard (10 yr plus shortboard surfer) and keep having a problem pearldiving on take offs. I don't think that I am too late on take-offs and I feel centered on the board, but as soon as I stand up the nose goes under.
Note, this board has had a repaired craked stringer alost through the center of the board. It is a quality repair job though and it is water tight. I just wonder if the additional weight of the repair has anything to do with this.
Also, I moved the main skeg all the way back in the channel towards the tail. This seemed to help a little.