Switch to Bloom Now ? (pics)

[koldvoid]

hello folks, my first grow ever here, wondering when should I start switching to Bloom, been feeding Sansi grow even after preflower from what I've read, don't switch right away, I have 3 autoflowers, on LST, 2 Nirvana NL (auto) Cbd crack auto Fadtbuds. also should I remove LST or keep adjusting it.,any guidance n tips would be appreciate it.
NL 1 (40 days) no signs of preflower yet

Cbd Crack (around 32 days) started flowering around a week now.

NL 2 (38 days) started flowering too early I think.

 

[Doc Nober]

Measure your plants on a regular basis.When the stretch is over, hit them with the Bloom. Unless you have an unruly one with height becoming a concern, that you can feed Bloom to prevent stretch ,(to some extent) I want to see the same measurement for 3 consecutive days in a row,with no change, than I use the Bloom.

 

[koldvoid]

ah that's a good way to do it, I'll do that but it's gonna be hard with all the LST. NL 2 had pistols since almost two weeks now