I have 2 plants out of 6 that are drooping. The th...

Those pots are the most concerning issue as stated above. They are meant to be planted directly into a different media ( soil, coco) and the pots degrade. I HIGHLY ( and soberly ) suggest a replanting ASAP. Put some Mykos or similar product on the roots as they have taken a beating 🤣🤣🤣 I would suggest using 1 gallon pots until you get the watering schedule down. Also, NEVER use old recharge. The good bacteria are dead and the bad bacteria are plentiful ( which I believe is the true problem, you may have given your plants some poison water.) In either case, replanting is going to be a GREAT start to getting things under control.

while there could be other causes given what info you provided and the lack of other information.. your pots look really dry.. this is underwatering most likely. Give the girls a proper irrigation and don't try to choose the volume randomly... give what it can absorb with a little runoff. if it's regular interval for fertlization, no problem. stick to whatever schedule you had. proper watering habits water the entire pot and not some arbitrarily choosen volume of water per arbitrary days between... simply what is necessary to do it. that's not "overwatering." then wait for proper dryback/drinking to occur and repeat. if in soil minimal runoff is fine to ensure it all gets wet, and in soilless you want 10% minimum runoff to maintain EC of substrate since you should be fertiliing every time in soilless grows. whehter you fertilize every other or every third in soil is mostly irrelevant as long as plant remains happy, but always make sure entire pot gets wet or it will cause problems in long-run even if not the first few times you do it. if you rely on weight of pot to determine when to re-water (lift and become familiar after proper dryback - dry 1" deep in soil), it will be the same volume per pot (assumes same soil, amendments for drainage etc etc...) this is what you can use to more effciciently mix up a proper volume of fertilized water and have less waste after that sits around. (24-48 hours is ok, but stagnant water is generally no good to use)... the first cycle you have to guess unless familiar with pot size and soil used. overwatering is more about frequency -- if wet all teh time you invite infection. OR, less likely you dump too much in for too long and the roots are deprived of O2, which is obviously easily avoided. This takes a whole lot of runoff in any substrate with approriate drainage qualities.. .you look to haev a decent mount of perlite in soil.. 50/50 is best but less is still okay. So it would take a lot of extra water to cause droop from 1 irrigation.

They droop because they are severely underwatered and should be replanted to proper pots. Those things are mainly meant for sprouting, they don't hold any water and go dry each day.