The light cycle is a never ending debate. My one friend swears by 18/6, others by 24/0. If your plants are clearly thriving better under one then another, use it. They both work dandy. If you want a compermise try 20/4 (I was wondering if doing the first 3 weeks of veg as 24/0, then the next 3-4 weeks with 20/4 then the final 2-3 weeks with 18/6 so you're weaning them onto 12/12, but it may cause undue stress.)

Your grow is simaler to mine so i'm enjoying it. So far those are some healthy seeds. I wish ya good luck, ill be watching and rooting for you