Newbie's guide to jetski/wakeboard happiness

Hi all. We're trying to tow a wakeboard behind a jetski - which seems
to have enough umph - but the nose of the board keeps diving underwater
(this may, I suspect, be a result of my newbie incompetence) but we
have a niggling feeling it might be something to do with either the
speed of the jetski or the height of the line. From previous posts on
the jetski and waterski groups they are talking about 17-20 mph (20mph
for planing). Is this correct? How should they apply the torque? (let
it rip aka water skis or something more subtle?) Could some lovely
person write the driver's guide for using a jetski avec wakeboard? If
it's any encouragement we can ride the damn thing but it ain't easy...



Thanks for any advice. Love to you all from Papua New Guinea...

Rich