Thanks for the feedback on ph. I've also had some mag deficiency with Jack's 321 at 5.8-6.2 ph, going to try 6.2-6.3.It's looking like an adjustment in Ph was all I was needing to correct the Mg issue.
No new spots or discoloration.
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This is about the worst of the tip burn I'm seeing now.
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Ec is @ 1.6 right now and I'm planning to hang around there unless I see new issues arise. I'm starting to transition to the mindset that a higher EC during veg and backing off after the stretch in flower is the way to go. There are quite a few times I've run across this line of thinking and it makes some sense to me. During veg you're growing the whole plant= Lots of nutrients needed. Flower you're just making buds= less nutrients required.
I'm probably wrong, but I'm still going to give it a go and see how it shakes out.
Anyway,
Happy to say I'm back on the Jack's gravy train and am 100% completely satisfied again @ 1.6ec/6.2Ph 9 days into 12/12.
Another factor may be my fluctuating and high CO2 levels a lot of the time (up to 1400) closing the stomata, decreasing transpiration and reducing nute and magnesium uptake? I have an Autopilot CO2 logger and just ordered a cheap monitor to move around the house and figure things out. Also got rid of the old gas stove with pilot lights.