Can I Transplant after sexing plant??

I have a grow room that will fit 8 large enough pots to grow a plant. However i want to be sure that I use all of the space by having 8 females in those pots. The last grow I ended up only with two after losing 2 others as males. So my question is can I grow say 20 plants in smaller pots, switch to flower, sex all the plants and after that take the 8 strongest females and transplant to their final growing pots? my concern is stunting growth or hermaphrodites. basically is it safe to transplant in flowering stage? Thanks for the help everyone!

I don't think transplanting when they are in the flowering stage is such a good idea... the roots stop developing on the plant in the 2nd or 3rd week of flowering so the roots wouldn't have time to fill out your new pots.

Take cuttings from all your plants and sex the clones by rooting them on a 12-12 lighting cycle.

mismos is right but take clones early into the veg stage. From that point you're growing all females and can select hardiest plants to flower.