AB so FUCKIN loot ly !!! Lmao... yeah man, distance of yer light is directly correlated to the amount of photons yer ladies receive man = P A R (photosynthetic available radiation) thats the power supply man. + how many plants you have, nevermind, better yet what area is that one 600W hps lighting ? Anything over 3×3 and you've gound the reason. Also your reflector plays a role too. Some reflectors are more of a focused beam, meaning they force it back down on the plant, such as a radiant or daystar by hydrofarm. If youve got one of those giants like a raptor or magnum xxxl they SPREAD the light more than direct it towards a specific area. And since you see my reaction, OF COURSE YOU SHOULD CRANK THAT BAD BOY UP !!! Whatever yer ballast theres no reason you should underclock it unless yer temps are uncontrollable. 79-82 is a bit on the high side but not enough 4 you to experience any loss. PUMP THAT SHIT N2 OVERDRIVE !!! superlumens or whatever the overclock setting is on that ballast. And let M get 18 inches to the hood. As long as you have adequate ventilation a fan or 2 oscillating so you have no heat pockets you'll be good. With the additives i would hold off 4 now till you read up a bit more and start off slow with the next run. But look into that PK shit from canna i told you about. Its a finisher and its the complimentary one to the line your using i believe. Its not considered an additive, thats pretty much the base. Only your in the last stages. Do the light change up though ASAP, im sure ghe stretch is done by now. How many weeks have you been flowering exactly? Since you flipped the photoperiox to 12/12