I have seen an examination of conscience that asked, "Have I struck a person over whom I do not have authority?" so the relationship obviously makes a difference.
To strike a wife when she does not deserve it would be a sin against justice. I suspect that the issue of justice is more important than that of anger in these cases.
If you can't see that Christian marriage brings a man and a woman into a relationship that rises above that of mere authority and subjection, then I truly feel sorry for you. You are one of those self-hating women I take it. It was as a result of ORIGINAL SIN that women became "SUBJECT" to men. But, otherwise, before then, the relationship was more that of helpmate (as per the text I cited before). And the Sacraments are different ways of undoing the damage wrought by Original Sin. In Christian marriage, the woman is in a place of honor and not one of mere subjection, as a helpmate with great dignity. You completely miss that in your analysis.
And, yes, I also think that it's wrong and immoral to "own" people as slaves ... as if they were your property.