There are some adds from technaflora that you can use in order to increase yield and density of your grow . There's the bloom and boost solutions . Although these work well there are far better nutrients out there . I personally like Advanced Nutrients , the system is really easy to use and the results are super awesome !! For bud density and bigger yield there are a few products that Advanced sells I'm really fond of . Firstly big bud is really really good helps get them little puffs into full blown flowers quickly then at the end of the cycle there's overdrive which helps the plant finish and really swell up . You may also wanna consider root boosters even , bigger the roots bigger the fruits . You way also wanna consider making your canopy more even this will encourage the bud growth to be the same throught the plant so you end up with much fuller flowers at the end rather then just a few here and there. This will definitely bring your yield up . Lastly its important to regularly check your plants run off in flower so you can see how much your medium has in it as well as being PH tested so you can assure your plant is absorbing everything it needs to thrive . I hope this information serves you well on your quest ! Happy Growing!