Watering

Is your drip setup in a serial manner? Or parallel? If they are setup serial then 1st nozzle will have more oomph than any that come after effectively giving more water to some than others. Watering with any form of alkaline water will also quickly clog nozzles with salt. Not worth time in my experience.

I would get a litre jug n feed like that get the feel for what they want..how much and when,, nice routine..looks like more water no me.. that's my 2 pence anyway. Much love. Peace out..

a plant that big might need more water, DLI might be to high, hard to tell without more details

Are they droopy after an irrigation? If so, that means you need to constitute your medium better - More perlite or similar to improve drainage. Soils should be 50% drainage amendment of your choice. Coco only needs 33% as it holds 2/3rds the amount of water per volume as most soils / sphagnum peat moss based mediums. Not using old stagnant water, correct? If the medium is moist, it's not a lack of water causing it, assuming you don't have some weird watering procedure. irrigation SOP in case you are doing it wrong. Water entire volume. Entire thing should get wet. Anything less than that is fucking up - if this raises alarms about over-watering then you've got some bro-science stuck in your head. In soilless, you want 10% runoff or more (waste water). Wait for appriate dryback (in soil top 1" deep dries or sooner in coco etc... this can vary a bit but needs some minimum amount of ~33% weight loss at least) Repeat the above 2 steps. If you do those things it is impossible to over-water or cause any problems due to your watering habits. Proper drainage is necessary and assumed as stated above too. Keep it simple. It's hard to fuck up watering a plant. Usually peopel fuck it up when they try to do some weird ass esoteric watering predicated on their superficial and misguided feelings on the subject. I wouldn't try to increase frequency of irrigation in soil. In a soilless context you can gain some benefits to more frequent fertigations with minimal dryback between of about 33% loss of water-weight. If you irrigate at same loss of weight, it requires the same volume of water, so you can plan ahead in that regard. So, if you are good here, you can rule out your watering habits. If you have some weird convoluted watering procedure, change it for your own benefit as it may very well be the cause of what you see. Partial watering leads to superficial roots that are less effective and also intrudices risks of dry zones inside your substrate even immediately after an irrigation. Other reasons plants may be droopy - Too much light per day. Maybe some old nasty water could do it, if leaving it out for weeks at a time?

Have you tried sticking your finger in the pots to determine if the substrate is too wet or too dry? Do this and then adjust your watering amounts to rectify the situaton.