If you repot and there is no roots and the bottom of your container is all wet you are watering too much. You can water the fuck out of some strains and they will look fine up top, but when you flower they don't produce much. Why? because roots=buds. Because the plant was overwatered it didn't have to grow many roots to get the water it needs. Pick up your containers before you water, only water when they feel light (like almost totally dry). This will force the roots to chase the water down into every part of the container and fill it with roots.