...looks like a variety of problem here,... you say this started flowering, stopped (light cycle change made then?), then started again? I see nutrient defc's too, so advanced it's hard to pin down,.. P for sure,. micronutes,.. might be Ca-0mg issues too,... I suspect off pH in the soil as well,... underscoring all this is the typical iffy-shit genetics Stitch is well known for,.. we have had a long history with him here, starting almost at AFN's beginning!

..used to be pretty good, but then quality control went out the window, and he heard it loud and clear here from $$ paying members!
I think you need to get them onto a 12/12 schedule and force the issue, if you want to try and flog them across the finish line,... soil pH needs to be determined first though, to see if the defc.'s are lack-of types or caused by lockout,...