Forgive me for intruding as I don't qualify as a "Pro"....But I noticed your Dynagrow formula had a higher P percentage than the N percentage.....

Most grow nutes ...at least for soil...require the Nitrogen compounds [N] to be in higher concentration to Phospherous[P] and Potassium[K] ...

During flowering the P ratio must be higher than all other compounds....It's to do with the plants different nute requirements ...

Perhaps you knew that already but it just seemed a little odd that your nute formula had a strange composition....Maybe the lack of Nitrogen is hindering growth.....plants do take a while to grow though lol and growth rate is genetic and strain dependant...