Too much dark is just as bad as too little when flowering.

The biggest problem too much dark presents is the massive reduction in yeild.

Also, too much dark will accelerate the budding process and cause your stuff to mature way too early, potency wise, and you still have little buds.

Since you are in day five, I would ASAP get a timer and get them on schedule. Since it takes 3- 5 days to infuse the genetic clock, you are right on the cusp of the point of no return.

Either restore to 18/6 till you get your timers problems fixed or continue to mannualy operate. But you are at the CRITICAL MOMENT of time either way.

Now I HAVE INDEED done a 10 day plant taken from 12/12 and restored to veg without any problems. She continues to grow hairs though and she is growing well...but in vegetative mode.

I even topped her and new growth is happeneing so all is not lost. Just make you act quickly on your move one way or the other.