Soil EC low and not rising.

0.1EC is around 50ppm on a 500 Scale. I doubt its really 0.1EC/50PPM, Happy Frog is kinda hot and all the toher things adding into are also going to boost it a bit. May be an error in how your measuring soil EC or the monitors its self. Plants are looking happy though in the first few pics. the last ones they looking a bit overfed. With soil you want to feed it once and then water the next 2-3 times but not till runoff. then feed again with a bit of runoff. It holds onto more of the salts then other mediums in my experence.

fertilizing in soil is like learning to ride a bike.. depends a lot on the soil and fertilizer used. as the soil contributes less over time, you slowly ramp up fertilization. It might be best to react to mild leaf smyptoms the first cycle and keep track of when such things happen and frequency/concentration of the fertilizer etc.. then you can review notes and avoid the symptoms altogether - for the most part. Any time you change products or soil, may need to relearn a bit. you can learn in less systematic ways but it'll take longer with more fuckups... you can wing it too... whatever floats your boat.

You are measuring soil ec with what? For a metre to read ec requires two things water and salt. For you to say you added x, y and z nutrients Into a organic soil of happyfrog and still say that you read 0.1ms/cm? That's literally impossible when water is present. So either you don't have a ec metre for soil maybe it's a tds for water solution. Something is not right. If you go the organic route then I'd say repot Into airpots, oxygen is often overlooked In its importance within a medium. If it's under 0.5ms/cm then not even the microorganisms are functioning no oxygen, no micros, no organic breakdown, no breakdown no new salts. Only thing that could wipe out entire process is a pH skew with a lack of O2. Gluck