The thing is, we don't know what our qunari inquisitors used to do before becoming important. Were they warriors, craftsmen or maybe peasants?
One of the reasons why qunari men are so bulky is because they were literally bred to be this way. To be nothing but a perfect canon fodder. It is literally in their blood, in addition to being naturally hulky.
Sure, qunari women are bulkier than women of other species. But they still are not as bulky as they would be if they had been bred in the same way
Selective breeding is all good and well, but would that not extend to the females of the species as well? I mean, I can't imagine it's possible to only breed the males of the species to have bulk and muscle while keeping the females lithe. It's not like males and females are that genetically different, apart from the whole x/x and x/y thing. It's been some time since I had biology in school, however.
(And the only thing I remember is that roosters choose their sex partners after the image of their mother. So if a rooster happens to imprint on something other than a hen and, for example, views a dog as its mother, he's gonna try to breed with that species later, since he believes himself to be the same. Well, that and a few things about recessive genes and splicing. And you may thank me for that unnecessary information later, when you're on a date and awkward silence ensues and all you can think of is 'Hey, did you know that roosters sometimes fall in love with dogs?'.)