I would never top after switched to 12/12, your yield will go down big time . It wont have enough time to catch up and split, because its forced to flower.
You have been misguided, Just get the detailed knowledge of topping, its of cutting the tip of the plant,
to get more branches, so your plant will be bushy,
whats the use of it once its in flowering stage..
yeah idk i was just thinking since your plants are supposed to get 2-3 times there size during flowering? that maybe it would be ok but yeah fuck that ill wait till my next grow for sure, definately got some things to learn about till then lol