What do you think of the deficiencies visible on some of the larger leaves?

Don't boost any nutes yet. She looks, if anything over nitrogen fed. Make sure you are not feeding in every watering as this helps move around the salts in the soil 🌱👍

I think given your nutrient numbers and your growing in soil... Chances are your overfeeding and not the other way around. Soil has plenty of nutrients for Cannabis to grow. When you start feeding nutrient based water in the second to third week. You are adding more salts then the root mass can possibly intake. It's very common among newer growers to want to feed sooner rather then later. But it's kind of the opposite idea of how you want things to work. In my opinion it's better to see deficiency then signs of excess. The reason I think it's excess again it's just because of the overall condition of the plant. if you've been feeding nutrients the entire grow then this is most likely your culprit. You should check your EC. And that will give you a lot of information about what's happening. I don't wanna say a definite number for your plant size but if your EC is high.. Think about changing your growing practices a bit. You'll save nutrients and money if you don't Overdo things. Water is your friend.. Even unbuffered water. Especially if growing in peat moss which tends to be on the acidic side.