If you could pick one..

I'm currently trying to stay organic, growing in a mix of soil, worm castings, some added perlite as well.. Using foxfarm 3 part nutes.. My question is if you could pick one more supplement for flowering what would it be and how would you use it? Also say you got like an extra 50$ what would you add then to flowering to add weight and resin, ect as far as nutes are concerned..? I'm also looking for procedures for getting rid of lower branches and what stages I should do so to get my top growth to be better and since my 400w didn't penetrate to the lower branches of my first plants. Any links to such documents would be appreciated. Soon to come will be pics of the newly designed growroom once it is completed.

Molasses.

bat guano