I've gone/am going through a similar thing with Alfie. She is testing her boundaries to the limit! I've had a few bloody fingers, and she's had a few time-outs in her travel cage (no toys). She is definitely biting alot less. The link below is an interesting thread from danmcq - it may help you at least understand your greys behaviour!
http://www.greyforums.net/component/option,com_joomlaboard/Itemid,27/func,view/catid,19/id,160836/
Jane is right - your bird is young enough for you to turn this around, but it will/may take a lot of time and effort from you.
Hope everything works out.
Lyn & Alf
x
You can read a similar post of mine and some of the answers I got by clicking the link below.
http://www.greyforums.net/component/option,com_joomlaboard/Itemid,27/func,view/catid,5/id,156022/