Changing to flowering nuts

Usually I would of changed to flowering nutes at the start of the second week after switching to 12 hours but now thinking cause the plants still growing to leave it on veg nutes for another week?

I usually go 50% strength of veg and bloom nutes for 2 weeks after 12/12.
The stretch is on !!
I do some LST as well.

Only my opinion....works well for me. Others do it as well.
Everyone must develop their own techniques.......
Peace.