Hey Buddy 🙂
First of all, welcome, and honestly, thanks for explaining things so clearly. It really helps, especially when you’re new to the forum.
From the photos, the plants actually look quite healthy overall: good structure, nice leaf posture, steady growth. So whatever you’re doing, a lot of it is clearly working 👍
About the brown spots: in situations like this, it’s rarely just one single cause. Very often it’s a small combination of things, watering rhythm, root zone conditions, nutrient availability, or even just a short-term imbalance while the plant is growing fast. Sometimes the plant simply “shows” a moment it didn’t like, even if everything looks fine now.
What I personally like to do in these moments is change as little as possible, observe closely for a few days, and see how the new growth behaves. Old marks usually don’t disappear, but the plant will tell you very quickly if it’s happy again by how fresh growth looks.
There’s no rush here, and no need to force a fix if your gut tells you things are stable. Plants are surprisingly good at self-correcting when conditions are mostly right.
Trust what you’re seeing, keep it simple, and let the plant guide you a bit, you’re clearly paying attention, and that already puts you on the right path 🌿
If you feel like sharing more details later, people here will gladly help, but you’re absolutely free to let your intuition lead too.
Growers Love my friend remember this is just my humble opinion 🙏 keep us posted 🙏