well it doesn't look like you nute problems. but i wouldnt wait till they are bone dry to water. it confuses the plant. you should water when its not moist about 2 inches down. you can get a cheap moisture meeter, or just use your finger. and if you dont have a PH meter, get one. its crucial to your plants being able to bring in the proper nutrients to do the right job. when watering, you want to try and avoid starving your plants, and then douching your plants. they are going to wonder what the hell you are trying to do when all they want to do is grow grow grow.