I think you have more problems than drainage. 2 month auto that's still vegging sounds like a photo. Drill some holes in your pots. Don't transplant it and completely change the soil.I have an auto flower that is 2 months old, still in veg stage needs feeding but I've had problems with drainage and I believe that the soil is staying wet for too long.
I want to try and transplant it into a smaller pot with some better soil mix so I can have more control with the watering/feeding but I reckon the roots could be too far grown to transplant without damaging them.
Is it a good idea to try and transplant into a better soil mix now so I can feed her more effectively or what?
Thanks