If these plants havent been sexed the large one is probably a male.Its hard to say.As far as less bushy, every D.Poison I ever saw was sparse.Dont worry about uneven growth.After you go to 12/12 their all going to change size big time.Just be prepared to adjust the grow area to maximize growth.Staging the plants to keep them even with the lights help all their potential.If your ready to go 12/12 its a little late to top or bend or anything else.All that should have been done in the first 4-5 weeks.-usdi Agaluga