When to start Flowering nutrients

My plants have been in 12/12 for a little over a week now and I was wondering when to start using Tiger Bloom. Through out the veg stage which was about 2 months I used Fox Farms grow big. Since I put into 12/12 I have used regular water.

Also I know on the container for Tiger Bloom it says you can use full strength every watering. For veg I would use Grow Big every other watering, what do you think?

you can switch gradually by mixing 1/2 strength of each veg and flower recpes full flowering recipe a month in flowering. i just speculate according to what i see on my plants and watch any signs of deficiency, theres no absolutes, but i like to keep some nitrogen till late in flowering

i use tiger bloom aswell and as soon as my plants go to 12/12 i start with the bloom nutes 1/2 strength at first then so on

thanks for the replies