Miscoloration on tips of some of the older leaves

Just noticed this and thought I'd ask how worried I should be.

I had a thrip infection a few weeks ago that I dealt with, but I think the thrips are the reason for the spots in random places, not the tips. (Correct me if I'm wrong)

I've attached two pictures of older leaves with discolored tips and one picture from the top of the canopy where it looks like the plant is doing decently.

It's outdoors in full sun in coco/perlite at a ratio of 70/30 - I'm feeding with Advanced Nutrients ph perfect, micro, grow, and bloom. Supplementing with cal-mag at like, 1ml per watering, the coco is buffed as well prior to planting.

It might also just be a remnant from earlier in the process where I used a different feed and made the mistake of watering with plain water most of the week, any input is appreciated. Thanks, guys.

I just checked https://www.growweedeasy.com/cannabis-symptoms-pictures and it looks like it could either be sunburn or potassium deficiency. Is sunburn a thing outdoors? I think any potassium deficiency will solve itself now that my nutes and water is PH'ed properly and it's fed daily.

Could be nitrogen burn.

I agree with @warble it looks like nutrient burn

warble said:

Could be nitrogen burn.

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Fish scale said:

I agree with @warble it looks like nutrient burn

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Gotcha, thanks. I was underfeeding it for the first few weeks. Could this be a shock response to now feeding every day? I'm still feeding less than I should, at half dose, but maybe I should dial it down a lot, to acclimate the plant to normal feedings?

I sometimes see recommended that you feed every day but I also see recommended that you feed every other day and use plain ph'd water on the off days. Not sure which is right.