you might take a look at a product in get up and grow called super boost.it is to be used once in the 3rd and 6th week of flowering.it lets the flowers open up and take in morelight..i think... i have noticed a difference on the plants i have used it on..its not too dear only 8 euro..check it out and get your self a jewliiers loupe to catch them trics at the right time..happy growing