If you double their height from the moment the entered flower, what do you feel like? It fits or nah? If it fits at double their first day of flower then it fits, if they already used up more than 50% of available vertical space then just top the fk outta them, that will teach them were to put their energy them lil bastards.
In regards to lateral space i noticed you are not using all of your potential lateral space. Sooo, get some buckets and open up ur tent horizontaly ( dont know what i mean, check week 3 at any of my most recent diaries and look at the sides of the tent in the "tent overview" picture.
I will try and upload some more pics of tent overview, but shit is paaaacked like a spliff with no air. Cant see pots anymore, just green, got a bunch of different strains, but mo issues mo learning, packed them biggies in a corner and smallest in another so the biggies only compete with eachother and dont block light for the smallest ones. A couple are about almost 0.7m at beggining of flower while others are about 30cm, so thats gonna be some height differences but its usually always manageable, just do some lst, or lower them by topping or hst during the first week of flower will hurt ur flower production just a tiny bit but will reduce the initial streetch by way much.