I feel like most people's problems under led is related to Ca..
The only difference shared on mass, is the lack of radiant heat. Which drives Ca movement. It's lower uptake is not in the slightest bit surprising. Ca deficiency should overshadow all other changes, which we really should of known before we even used them.
For years we knew flo's were useless, though still kept coming back to them. It's only LEDs amazing efficiency that has kept us banging away at making it work. I think Ca timing is the next big thing. It's already here, but we are not quite making sense of it.
On topic. If there is a tap, and an irrigation timer, an online dosing pump might be nice.
https://www.aliexpress.com/item/1005003516995217.html
That injects feed/acid right into your hose as it flows. Adjustable between 2ml per liter and 20ml per liter. You may wish to water down your acid, to match that requirement.