alot of people LST(low stress train) thier plants which will produce alot of side growth which in most cases in the reason why ppl have very very bushy plants. i have the same thing my plants are tall and lanky but tey have full sun allday mine are at 4 feet and alrdy starting to flower ( acctualy 3 weeks into flower). Like he said it could be strain related also but more or less beacuse of the LST.