Try n fill your pots to 1inch from the top mate, mAKE full use of them pots.
The one with retarded growth....looks like it's being overfed, this causes messed up leads as well as burn are you feeding ?
If so cut back on that one. If your not feeding run 3x the pot size of water through it and wait for it to dry, when you notice a slight N Def resume feeding at 1/2 what they were on before. Some strains are light feeders some are not.
Yes you could easily make 8 tops. Cut for 8 today and give them 2 weeks of tlc n you'll be fine.