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I wouldn't suggest for someone to rely on waste readings, though have you checked the waste EC once off? Don't start chasing waste numbers and all that. Waste of time. Especially pH. But checking the waste EC may indicate whether you're overfeeding, or not. If it's way high, well... 1.0 EC...

If that's the drainage waste you're measuring, you can expect the waste to be slightly acidic compared to your input, being a peat based mix. How often is it getting watered? Pot size? How much water at a time? How much waste? How well is it draining? Might it be staying a bit soggy or damp...

Outdoors, I think organic is better for the planet. Probably a bit easier to grow too. At least if growing in the ground. Better for the environment. Both in it's carbon footprint and it's use of carbon. Supports more life. There's only so much elemental phosphorus left in the world too. And...

I'd just give 1 good watering next-time it needs it. Then nutrients the following watering.

I think this ^ is way to go @ThatOneDudeWhoNeedsHelp Important to remember it's about balance. Easy to surmise a nitrogen toxicity if neglecting PK. I think it's good to be sensible this stage. I'd start at half recommended EC myself. Get good runoff.

Then, I would suggest you follow the manufacturers recommendations for it's stage of flower next-time you give nutrient. I'd say it's what it is. Important you keep to the recommended ratios of grow - bloom - micro. EC can be less than recommended, but it's important you use the nutrient as...

Cool! I was just wondering. Some people like to feed veg nutes for first couple weeks, then start flower nutes after.

Put it in a paper bag. It's a good trick couple days before jarring. Helps even the moisture out in the buds. Slows drying down a fraction, so it's easier to catch it at just the right time to store long term.

Seems sensible. Are you following the manufacturer's feed chart, for flower?

Nah. Good proper feed once the soil dries, she'll come around, I think. Make sure soil's dry. Get plenty runoff. Avoid the calmag, give proper nutes. Start @ about half recommended to be safe. Increase as required.

You don't. Just carry on. Flushing a plant to achieve whiter ash is nonsense. White ash is achieved through drying/curing properly and adequately. I'm not against plain water the last week or whatever. Nice looking grow! Easily have a few weeks left there. More like a month. And, when it all...

If you have a pH meter, or pen, you can test pH. Using distilled water and soil sample. You'll have to find the ratio yourself. I use the kits. I don't think you need to add any extra nutrient, like iron, or sulphur. Looks locked-out. I don't think it's a good idea to flush. But, I think plain...

Given it's peatmoss heavy mix. I'd suggest it was sulphur deficiency, before iron. Looks more like sulphur deficiency, too. Testing pH will tell.

I wouldn't rely on runoff. Test the pH properly.

Each photo, the soil looks too damp, almost soggy. What size are your pots? How often are they getting watered or fed? It certainly looks like lockout of some sort. My suggestion is, you're watering too often. Or the soil's holding too much water. Or both. Also, that's a lot of peatmoss and...

As I said, I think you're better off following the chart and using the trio, after plain water. Whether you choose full strength is up to you. I think you'd be better starting at about half. And, if the plant likes it, you can increase EC to whatever after.

My Bluelab Truncheon's got 0.4 ec / 200ppm 500 scale / 280ppm 700 scale. .333 sounds about right on the 700 scale?

And double check your meter and all that. 350ppms isn't much, by any means. You could easily be higher. If meter checks out...maybe opt for the trio + stick close to the chart dosage / ppm? Just play it by ear. See how they do after water. I would pH to 6.5, myself. Organic, water only, I...

That's ok. About pH6.5 should be good. Some wouldn't even bother. Your nutrient, I'd follow manufacturers recommendation for pH, though.

If it's under 7.5, I wouldn't personally bother growing in soil, or potting mix. Matters a lot more what's actually in the water. 150ppm, or whatever, isn't a lot.