I topped my plants 2 times so farI fooled this batch of clones into being shorter, after experiencing the mother taking over a whole tent.
Topped them in veg a time or two, and stuck them in flower at about 18oping inches or so, using only 3 gallon pots.
Dont know if it helped, but they stopped stretching and started stacking at four feet or less. Still plenty of room, they are taking 100% on the light. Little cooler since friday, tent=88 degrees! Close to end, other than one plant about 3.5 weeks behind in flower.
they are still appox 24 inches now
hoping to avoid the big stretch.