In order for youe second wave to make it you must get then flowering today.. Truth be known I am about 5 days away from white heads everywhere on many of my plants. If you do not get then out very soon you will have no second harvest of worth. You do not have time to try to get them to flower if you attempt trying to start flowering on AUG15th... It takes about 2 weeks to get em flowering so by the end of AUG begining of sept they would begin to really flower.
I believe that you have a 50% chance of pulling it off.... But you must move now, and get your 2nd batch starting the flowering process today or you will be left with a percentage of 0% before long.