Sorry I don't know what I was thinking when I typed that. I edited my post.
I do train during veg and into flower until the stretch stops.
I have crushed stems and then re-crushed them. I've also crushed the stems and then crushed above and/or below where I originally crushed to further train them.
I crush stems not only to control/slow the upward growth, but imo, even more important, the crushing/training is to fill in the canopy and make it full and even.
When you crush a stem, try to crush it in a direction that fills in an empty space in your canopy.
