How exciting for you to have this opportunity! Oh, how I wish I had answers or advice for you. As I read what you write about your wife, it sounds to me as if she is two completely different people with two completely different personalities and the behavior you describe really concerns me.
Has she always been this way the entire time you have known her? If so, what was her upbringing like? It also seems to me that perhaps she has some anger management problems. My senses (spirit?) tells me that something else is influencing her behavior and that you are going to have to dig deep to find out what.
I'll be quite honest with you plk, she sounds like one terribly unhappy woman and until the source of her unhappiness is discovered and addressed (I believe it is something deep within her psyche), I can't imagine your situation changing for the better regardless of the environment you live in, or how successfully you apply DB techniques to your marriage.
May the Lord bless you and keep you through this time of transition, my friend.
LG
A blessed and happy marriage is a union of two forgivers and Him, because...a cord of three strands is not quickly broken. Ecclesiastes 4:12.