Self-watering pots

You'd mix a proportion of these in with your medium making a super soil. Then top dress first week of flower and 4/5th week of flower

Doesn't that stuff need to be watered-in? So a bottom feed irrigation setup may not be the best option even if you can go through some trial and error to make it work. bottom irrigation is just a bad idea to start. The only context i'd use it is a no-till situation with a super soil that can provide the vast majority of nutrients for the entire grow. mineralized water (aka fertilized water) is going to age those wicks quickly and reduce their wicking ability. So, that's a constant need to buy new ones and a deterioration of performance if you wait too long to do so. It doesn't allow runoff, which means buildup of nutrients in the medium is a bigger problem than normal and more difficult to mitigate. I know a guy that uses blue mats and he likes them, but he doesn't fertilize through the bluemats or else they'd clog up significantly more often - again more effort and time keeping it functioning that you wouldn't normally have to do. just diy it and save money... the pressure compensating emitters are the way to go. A lead line, some 1/2 lines over the pots... handful of cheap emitters.. can water 12 plants for ~50 USD and maybe some yearly maintenance that's far less effort by comparison. hell, fuck cleaning it... just replace it every 3-4 years, lol. An hour of my time is worth more than 50 USD.

the 444 and 284 with worm castings sounds a lot like Gaia Green's dry amendments. I would do the same thing you have done, but make your medium more aerated with perlite and set the self watering timer on one of the lowest settings it can go. You want a bit of a dry back cycle with amendments or its just going to wash em all out. If its recycling this water then maybe can have it going more frequently however all the organziums in this will lilkey clog or grow something in the tubes and stuff of the equipment. Ideally this would be used in a hydro setup with just coir/peat and perlite and you would use a nutrient solution that is fully fortified.

Try not use slow-release fertilizers directly in the reservoir. Add them into the medium itself. Water-soluble or liquid nutrients designed for hydroponics are a safer option, as they are less likely to cause salt buildup. This happens because the fertilizer sits around the roots for too long breaking down, potentially causing issues like root rot, nutrient binding, and preventing proper water transport. For nutrients like earthworm castings, you can top-dress the soil with them and water them in before refilling the reservoir with clean water. Gluck.

More than likely your going to have to mix those dry nutrients into a tea. Steep it with a mesh bag the feed the plants the water solution to the watering tank for uptake. Just my understanding from some things I've read. But there are far more experienced growers that can shed some more light on the subject.