@Cannaficionado, take this with a grain of "salt", but like Fruitz was saying, no runoff with soil. You're basically watering out the nutes in the soil and watering too much.
In soil, you shouldn't have to feed till 35-45 days or more depending on your soil and the time it takes whatever you are feeding them to kick in. I use build a soil stuff.
Pretty sure @Frankthetank(correct me if I'm wrong) uses Promix which is a different animal than soil. It's mostly pete, so it doesn't have a lot of nutrients in it to begin with. So, he has to fertilize regularly. Soil has nutes and if it is a quality soil, no need to feed till it starts to deplete them.
Get yourself some kind of good moisture meter as well. I use the blumat ones and
@WildBill uses the ecowitt. Check those out, they will help a lot!!!
just my 2cents...
Man O Green has a kelp/fulvic formula for a kelp foliar from Va Tech