Mouthy or biting dogs

[babsbeeble]

My 7 month old golden retriever, Molly, has some biting issues. We have tried, since we got her, to say OUCH, to freeze, holding her nose and saying NO etc. It seems like we've tried it all! But, she still will get bitey with us.
It starts of as a game to her, I think, and she doesn't understand that it is hurting us. It eventually gets to the point that she has to have a 'time out', but that only solves the problem temporairily.
We always have chew toys available for her, and frequently give her Kong treats and ice cubes. I don't like the idea of rewarding her when she bites by giving her something she likes. Although, she does respond well to reward when doing something positive, like teaching her to sit, lay down etc.
I am running out of ideas, and patience! Can anyone help!