I have four plants of 2 strains that are 4 weeks tomorrow. They are very bushy and growing horizontally, but not so much vertically. They look healthy and have huge roots, but the tallest is only 9 inches. I planned to flower them in another week, but expected them to be twice this height by then. Should I veg them even longer? I'm thinking of putting the lights higher to encourage them to stretch. Thoughts? Thanks in advance and +rep for good ideas.