and i dont think you have a overwatering problem yet..the leaves will start to droop and curl down and stay that way.best way to tell when to water is by the overall weight of the plant.check the weight of the pot after watering...wait for the leaves to get a slight droop to them..check the weight of it again.that way you can tell when its heavier its ok...starts getting lighter then water it.its a lot worse to overwater then underwater a plant.letting the leaves droop before watering is better then watering before it needs it.if you just stick you finger in the soil that tells you nothing.the top few inches of soil can be bone dry..yet the soil in and around the roots can still be holding water