HST the tall ones after vege growth ends.
there's genetic variety as well as changes in environment from grow to grow, if they consistently grow too tall, you should train them horizontally a bit longer on average before letting them go vertically. Start taking now the timing relative to the display of preflowers. this should be a fairly consistent method to time it relative to biological flip to flower phase. (flower phase started before you could see the preflowers, but that doesn't matter)
if you have a suspicion a strain will be lankier than others, train it 5-7 days longer than the other plants...
while still some fog of war, you get greater consistency within a strain with better breeders of photoperiods.