[avfletch]

Leaving the position issue to one side (I'll give it some more thought and come back later hopefully). I find a move like this works better when the action goes -

Raise - call - hero reraises.

This way the original raiser is faced with your reraise and someone who has called behind him giving you more chance he will fold. The caller has usually got something marginal that he will not continue with in the face of a reraise.