The reason is that women have a lot more responsive hormone system than men and the stress hormones are the reason. Women's acne fluctuates with their menstrual cycles, with pregnancy, and with birth control pills. I can't think of similar chronic hormonal triggers that men would experience.
Large pores are a function of sexual hormones and their expression.
Some of this is genetic so, although the pores can be made less obvious, they will always likely be larger than the average. But you also state several times that SR is the most important of the three. Even in the 30 year old, SR might be enough to reverse it all by itself. I would never recommend taking the antibiotics unless the acne had become infected and, even then, I would try hot compresses for a day or 2 first. How long to take the antiboitics would depend upon how long it took to eliminate the secondary infection.