You can pay to have your seed sexed pre sprout. Run 4 males of different strains don't bother to veg them very long you only need a few pollen sacs off each. Then Run your 4 females and use a little pollen from each male on a separate branch of each female. So you can have 16 varieties of new seed twice a year or so
I would not be stressed about a plant count on a male run.
1 your not producing any bud
2 not gonna smell like your growing flower
3 it will only take about 10weeks total
So I would collect as many males as possible and collect all your sacs in one run.
Then veg the hell out of your females with lots of croping\fiming so you have lots of separate branches each gets it own pollen sac then the only limit to crosses you can make is the size of your pollen collection