do you have an exhaust system inside the tent taking up headspace? I move mine outside...you have to account for stretch and if photo and any sativa dominant, you can get 1 to 3 feet of stretch so I highly recommend the BENDS...
I bend after dark, little at at time to not break / injure / over stress. Also, if I hold back water, they will droop and that is a good time to start to "Tie me kangaroo down boy"...Do not forget to stake the apical stem to stop the lean from tearing the plant from its root / position in the container. I insert a pole at the far opposite side (of the bend direction) as an anchor and use pipe cleaners at the base and point of the bend
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I am also lucky enough to have my driver (light) outside the tent with 6 foot leads...helps with heat and space