yeah, just top them like three or four nodes down, and clone the toppings... that'll get you on your way to making nice squat bushy moms...
plus, whatever females you don't end up using for moms (well, atleast lets hope that there are more than one female of each kind) you can also throw them into the flowering chamber too... they'll just flower as a normal topped plant would
that way, when flwoering, your not wasting a bunch of space with bigger males... you'll just have the smaller clones and select females flowering from the get-go...