Improving water retrieves

I have tried to take Olive out to practise water retrieves everyday this week in an attempt to improve them. She waits really steady when I throw the dummy, swims out great, gets the dummy, comes back and immediately drops the dummy and shakes when she emerges from the water. I have had to use a really firm 'HOLD!' to get her to keep on to the dummy, and have gradually increased length I am away from waters edge. To begin with we started out with me saying hold as soon as she got near the waters edge until she got to me http://www.youtube.com/watch?v=okfk6r1JWgI&feature=youtube_gdata_player

then after a few I was able to do some not saying hold at all. I think I will have to keep these sessions up for quite awhile before I am able to do just send her for a water retrieve and know that she will never drop the dummy. Still, I was pleased with the distance we got from the waters edge at the moment
http://www.youtube.com/watch?v=4LoxCxHhWKA&feature=youtube_gdata_player
I have been continuing the 'out' command training by stopping Olive to whistle and then throwing a dummy out to either side and sending her for it, which is going well. I think I will continue with this slowly to make sure she really understands this command as she is still young.
http://www.youtube.com/watch?v=NMvBrZsEvE4&feature=youtube_gdata_player

Still doing the blind retrieves too, I think I enjoy these the most. I just drop the dummy whilst walking, and then recall her and send her back for them. I have started doing 2 retrieves now, so I will drop one dummy, walk on, drop another, walk on. and then recall her and send her back - she will find one, and then I send her back for another which she doesn't expect so she has to work harder. Here she is doing two blinds - on the 2nd one I sent her off in wrong direction so it was my fault she goes off round the corner looking for the retrieve. I need to concontrate more where my arm is pointing when I send her!
http://www.youtube.com/watch?v=8oAIZifEXPg&feature=youtube_gdata_player

She will be 9 months at weekend and still coming along nicely :)