I often wonder about these feed charts, OGP.
Some prefer to modify doses based on ratios of NPK and other micronutrients to get to where
they like to be. And it works!
But then I think, why would a company that's trying to sell you their product publish feeding schedules that are not ideal for their product? I know that with any schedule one may have to make some adjustments due to the behavior of the plant or other factors. Still, I've got to wonder if following the manufacturer's schedule (with minor variations) will lead one to a total disaster of a grow? My gut says no.
Sorry, I'm thinking out loud here.
I'm looking forward to seeing how you do with the new juice!