If you have a 44 inch ceiling that is your limiting factor. Hold your hand under the light 44 inches above the floor and
see if the light feels warm on your hand. If so you are too close.
I want my plants to finish at 40-48 inches and I'm familiar with your strains. If you are certain about the 44 inch ceilingthen you need to put them to flower around 18-24 inches.
The kush won't double in height during flowering, it's a bushy phenotype, but the others will.
Note in most of your pix that the larger, outside leaves have just recently reached the outside rim of the pot. That means they have been slowly growing aboveground
while the main growing, the roots, reach the inside walls of the pot. Now that the roots have bottomed out you will see inch-a-day growth from all but the kush.
While vegging I have found my clones take 3-4 weeks to reach height while seedlings need 5-6 weeks vegging. Hope that helps. With your pots I would look to veg another week or 2.
Longer veg = more yield.
God luck, BigSteve.