first, genetic diversity is why the plants look different even if they are treated the same. Even their tolerance for stress can be unique to each.
light, climate, watering could all be a cause of what you see so you'll have to eliminate possibilities.
watering is simple... fully saturate, wait for dryback and repeat. if not doing that, amend practices. If plants droop following an irrigation, that is the fault of the mediums constitution. add more perlite or similar next time for better rootzone aeration... gas:water mix is important. heavy soils need 50% perlite per volume. Something coco-coir based only needs 33% because it holds proportionally less water. Both will hold roughly the same volume of water if amended this way and that's not an accident. if this is the cause, there's nothing you can do about it midstream. just constitute your medium with a greater proportion of perlite or similar next time.
Dense growth can cause slow transpiration (low vpd). That can cause droopy leaves. a selectively pruned leaf or even some axillary growth can help in this context. Prefer to spread it out before you cut anything. Also i'd rule out other possibilities first before choosing to cut anything. Don't think that's the case here.
overwatering is a matter of frequency .. i'm assuming you don't run 10 extra gallons of water through the medium during a single irrigation. As long as you are allowing the plant to drink up what you provide before giving more, it isn't overwatering. If you are not waiting for the top layer to dry, that could be part of the problem.
If vpd is very low, that too would cause this.
too much light over time can cause this too. even if you don't see the typical leaf damage.. slightly too much light will be tolerated intiaily but eventualyl the plant will droop and stall out.
limited info.. you'll have to figure it out.