So I go right into a 5 gallon pot of FoxFarm Coco Loco. Then I'd use a water sprayer for the first 2 weeks without nutrients about every 1 - 2 days. 3rd week I'd water about 16 oz of water and wait till the soil dries up. Could be like 3 - 4 days. 4th week is when I start adding nutrients Jacks 321 with Silica. Silica 5ml Part A 3.6g Epsom 1.2g Part B 2.4g all per gallon. My light intensity is set to around 660 the whole process.
Ah Kk, sounds like watering issue. Try this on your next run.
Saturate the soil before potting up with 15% volume of the pot then plant the seed (fabric pots wick moisture away from the sides).
Every 3 days from sprout give it water but simply up the volume. Start with 250ml for the first 3 waterings then up it to 500ml when they are like 10 days old. Around 20 days 750ml and so on until around 2-3L depending on plant size.
I found I had to water them around 2-3 weeks from the bottom to moisten the edges of the fabric pot because the amount the plant needs isn’t enough to keep the soil moist enough. Took about 30 seconds for it to suck up 1L of moisture.