Self-watering pots

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.