How are you removing heat from COB's? If you allow heat from cobs to remain too hot. you need active heat removal from your heat sinks. Many stories of hermies, problems, with excessive heat using cobs. 25w is the highest you should run your cobs in veg. All the plant needs in 25w/sf during veg and 35-50w/sf in bloom. It sounds to me like you are way overdoing it. Plants should pray all day long until lights out.
You know, you bring up "Pray". I have to ask you this. You say all day, but Ive came to the conclusion of sorts that when they pray, they have takin in as much photons they can for the day.
I know 1 thing for sure, mine pray at the same time every day. Then, i add an hour to sleep, to see if they pray at the tenth hour, and sure enough, on the 10th hour, they prayed.
Ive been watching this for a few days now.
So, you say they should be praying ALL day, makes me think what changes happens at the tenth hour that makes them pray for ME, personally. But nothing really changes at those times.
Or its thirsty,lol.. Because I water 1 hour after lights on, and last hour before lights off. in Coco, but they dont pray in the morning.
Ive read that plants can only take in so many photons a day, and usually 6 hours of direct light. So that is what got me thinking that maybe its a "Ive had enough" sign to reduce lights and let her rest.