i would switch them to 24/0... i run mine at 24/0 you get about 30% more... i have to run them 18/6 in the summer time due to heat issues... autoflowers don't need any dark time to do anything... the ones i might smoke w/other ppl i throw in the dark for 72hr before harvest... but that is just to improve flavor a little (in my opinion)... anything i'm only gunna smoke myself i just cut right from the grow room
plus i find tha 24/0 cuts down on stretch and gives you more compact buds