why would you throw away the feeding schedule entirely? I could see cutting back on The dosage amount, but don't try to make your own. If you wanna do all that, grow with stripped dirt and add in all the micro nutes yourself.
What I am saying is that every grower needs to utilize experimentation along with critical deduction and analysis because every growing situation is different in regards to feeding and watering schedules especially if using soil and soil mixes; and all manufacturers specs are even stated as "general guidlines".

And I do work with non-ferted sterilized soil when I grow indoors, it is far easier for me to control nutrient levels when not having a timed or water released variance.