I've got a similar problem to yours, but not landing it for a completely different reason.
I complete the whole move fine, but make the pass too late, often just as i'm hitting the water, but sometimes a bit later.
I've tried and tried and tried... Its so annoying
What happens to your kite after it gets ripped out of your hand? Is it flying upwards or downwards into the water ?
What kite are you using? Airpasses with hybrids can be tricky. Are you getting slack from your kite?
Video's and photo's always help, if you have any