have you been topping them? Wonder why only 7-8 after 5 weeks. On average most people veg for like 30-45 days then flower. For outdoors i veg inside for 2 month and top them as much as possiable.Depending on the height of your room. You could veg em longer. If you turned them over to 12/12 now. They would for sure double in size by harvest. What type of light are you using hps or mh? I would say go ahead and flower. being your first run. After you get some experience. then you can get some good seeds and grow some monsters.:thumbsup: