First Grow Oasis Autoflower RPK in a 2x4

Haven't started any nutrients yet, thinking they should still have plenty from the HF/FFOF I used to start them... Noticed that the leaves were starting to droop, so we watered a day early with a bit of runoff (was using about 2.5 cups of water every 2-3 days previously). The runoff was at 6.2 pH and about 500 PPM (no added nutrients other than recharge). After watering, the drooping/curling didn't get better, so now I'm thinking maybe they are over watered. Going to give them 3 days or so with no water, and hopefully they bounce back. This is my first grow, so your experienced opinion/advice is greatly appreciated. Updated a day later. No additional water given. Something to note is that I do have a tower fan positioned beside all of these and set to low & oscillate. It seems the pots closest to the the fan aren't getting the full force of the fan because they are kind of below it. As a result, the soil doesn't dry as quickly as the rest of the plants, and that might be part of our problem? Also concerned that maybe the leaves are getting windburned from the big tower fan? Again advice/recommendations are welcome!