I did a similar thing with mine. I bought five and got lucky, I ended up with 3 female and 2 males. The largest male was from a different stock than the females, so that helped to eliminate inbreeding.
With mine, once they had paired and I moved them to their appropriate tanks everything was progressing. I had two pairs with a single female left as the odd one out. I moved her to a tank to herself. The largest male and his chosen mate went into a 220 and they have gotten along since day one. They have spawned probably 6 times.
The other pair not so much, They had spawned maybe 3 times and then the male got very rough on his mate. I had to install a divider to keep him from beating on her constantly. Then one day I came home and he had managed to push the divider over enough to get past it. I was to late he had already killed her.
Each fish will be different and its hard to say why this male is so much more aggressive. They were in a smaller tank, a 75, but they were quite a bit smaller than the other pair.