FF...ok , here is some advice to you. On your watering try something new. This is something I learned in my first few grows. If they are in 10 gallon buckets, you need to give them more water on the days you water. Just watering to where water comes out is not enough. You need to water them with enough water/nutes that you flush out the old stuff from your last feedings. It helps give ALL fresh nutes and water and clears otherwise good chances of having buildups in your soil. In a ten gallon bucket, I would push at least 4-5 gallons through it each time then water again ONLY when the soil is DRY. cannabis Needs WET AND DRY PERIODS. Every other day is too much unless it is real dry. If you put a lot of water through them as suggested you will not have to water as much probably (unless it is REAL dry in your green house) and your plants will be thanking you for the refreshment. Make your gallons as you normally do with your nutes and ph balanced water and push em through. I have a 5 gallon bucket and some two gallons. On the 5 I push 4 gallons per watering/feeding and 2 gallons on the 2 gallon buckets.
Also what is the recommended strength on the bottle of your nutes? As far as the soil, if it's not killing them, hey can't bitch at you! LOL
Good luck,
Elway