@Azimuth I have been thinking a fair bit about your mix and how to get it to work better with a Sip.
Organic matter, regardless of what kind, only "needs" to be about 5% of a mix, and for growing good weed should be about 10-12%.
So my EWC when finished, is about 40% veggie scraps and meals, and 60% used soil, perlite, etc. So 25% of my grow mix is EWC, but only 40% of that 25% is organic matter, so 1.00 gallons in a 10gal pot. 10%.
With that in mind, and counting biochar because it charges itself with organic matter,
what % of your mix, compost, biochar, and ewc combined, is yours?
Too much will cause you to have soggy soil. Just right and it should wick the right amount of water up thru the mix. Too much of a good thing is real in LOS.
If lowering organic matter throws your ratios off, replace the parts you take out with perlite, and if it turns out to be a substantial amount, replace it with a mix of 2/3 perlite and 1/3 carbon.
That ups air and the extra carbon is just enough to hydrate the extra perlite in ratio.
Run some math on your mix and see what you come up with. Maybe we can kick this back and forth and get you a great sip mix for your small pot sizes.
Because it would lower your overall pot nutrition content, it may also be perfect for sustaining with Jadam/KNF potions.