Get your CFLs
Don't give plants away yet; you are going to have to throw out the males anyway and your plant count will likely be reduced to 4.
reeeelax... nOOb!
And yeah, you will need more light to flower but if you are flowering small plants in a cab, consider going heavy on CFLs in the proper spectrum for flower as well, to supplement your little HPS.
Go check out closet and cabinet. It can be done.