Regarding the embrace:
Why does it have to be either the woman or the man determining it? What's wrong with some simultaneous negotiation by both parties? Generally speaking, as you're getting ready to dance, it's pretty obvious what someone is comfortable with. Pay a bit of attention, use your instincts, and make the changes necessary to create a good embrace and good dance for both of you.
It's always a negotiation. Anyone that tells you otherwise is trying to sell you an idea rather than what happens every night at the milongas. The lack of negotiation skills has never been good to anyone.