roots need to grow and they need oxygen, it's a little tricky to keep the roots moist but not soggy, watering until it comes out the bottom at this stage is way to much water in the soil you're using. Get a cheap moisture meter probe and that way you can tell what's going on. Next time go from the 16 oz to a 32 then to the big pot that way there will be more roots. Give em some dark time they do stuff at night too.