Your Opinion: Potassium or Nitrogen Deficient?

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Located on only 6 leaves, Plant is day 28 12/12; Grow nutes were cut down to 1TSP, and using Bloom 2 TSP, quarter TSP of Cal-Mag.

Should I continue to use my full normal veg dose of grow nutes during flowering? Previously during Veg it was 2 TSP grow nutes, quarter TSP of cal-mag.

Your fan leaves will start to yellow, and die as the plant gets closer to Finish.
Your other leaves should stay pretty healthy.
IMO- It looks like you have a Phosphorus deficiency, and a Magnesium deficiency.
Check your PH. Make sure your running where you need to be.

To me it looks like N. and Mag. The purple stems are usually a sign of Mag Def.

Hmm, so I guess try upping calmag to half teaspoon instead of quarter, and put my veg nutes at 2 TSP again like in veg, with bloom 2 TSP.

The Ionic grow veg nute is 3-1-5, and bloom is 1-1-3. Calmag has 2% nitrogen, so was only around 3% without the veg grow nutes, perhaps these are low values compared to other synthetic nutes, have not really looked around at different NPK values of brands. Only went with the ionic grow, bloom and boost set. I will check pH when I water again, but all water has been pH'd before going in so I'm sure its in 6.5 range, but I will check run off later on.

Check your PH. You might be Locking-out Nutrients.

Well, I didn't test run off yet as it doesn't need watering yet, but I checked with cheap pH meter in the soil, is stabilized around 5.7, occasional bounce to 5.8.

It seems pretty accurate for a cheap model, I've had no problem pHing my water but I think I might have needed to flush in between some of those feedings, assuming its why its lowered in soil, my normal pH source water is 6.3-6.4

Its at about hydro pH, which is what the ionic nutrients are, hydroponic nutrients recommended to be cut in half for soil amendments. So flush with 7.0 straight? Or?

you should add some dehydrated lime into your soil.

I can pick some up, thanks I just googled it; sounds good. In mean time do I do a flush with 7.0 till I can amend the promix with hydrated lime?

edit: decided to flush with 7.0 bottled while waiting for hydrated lime. not too concerned as long as I can get the pH back in range relatively easily, will have to watch it from now on, thought it would stay at least 6.3 and climb as it dries then back down as I watered it, I guess some sort of build up or nute/salts caused the pH to be lower then I had expected.

Not much progression in yellowing, got hydrated lime on the way and flushed with some 7.0 purified water. Doesn't seem to be any more leaves picking up the symptoms.

After reviewing diff NPK threads, and comparing my grow/bloom and calmag feed NPK, my NPK is 6-2-8, in day 30 of flower, I think I want to change nutes next grow, not really into ionic that much. Want something balanced with more N and P.