Ok.....I think your issue MAY be just your ph leaping around here and there....the steadier the better in hydro. Also, change your resevoir often to keep correct ratio balances in your nutes. And since you are using well water....what is the ph of that all by itself? Ours is 130 but gives us ph issues so we use RO and CalMag. You'll just have to test yours and see.

More airstones is ALWAYS a good idea....never heard of an airstone doing HARM ..thats for sure.

If you can measure ppms and ph twice a day and let us know we can probably work out a good steady feeding schedule for them. Hydro works best when constantly monitored and adjusted according to your numbers.

Good luck.