some spot on low leaves (Brown or white)

k - deficiency? you've been irrigating with ph'd only water for 10 days? i'd lean toward a deficiency, but if it was recovering you'd have to consider that too... how's it changed lately? could be Mg-deficiency too -- those take 4-6 weeks to show up. consider a longer period of time to eliminate this one or confirm it etc... low on leaves means it is a mobil nutrient. other things can give a false positive for nutrient issues -- but under your context, i doubt buildup is possible with 10 days of irrigation. You've controlled your pH, too... so, feel confident about feeding again... if you check my answers, 9/10 i tell people to back off. i try to be extra conservative when recommending ramping up or resuming after any toxicity. Anyway, i'd say it's safe to fertilize again, and likely needs it. if you were water-only for a reason, consider adjusting your feeding formula a bit. what was the original cause for the flush? adjust that component a bit.

Normally that color comes from ph. But since your ph is good. It’s probably due to over watering. Look at your new growth.

This can be normal as most will self prune their lower leaves when no longer needed. If it's not spread I wouldn't worry. Pluck them off and keep growing!!

Once the spots are there, they never get better. You have to look at the new growth to see if your improving.cheers