If it makes you more comfortable, the other reason I begin at first pistils is because if you read the PB feed chart closely, you will see that they say to switch to flower feed (+ Big Data) “at the first sign of flowering.” I call pistils the first sign of flowering.
Also - I was thinking about your leaves and I don’t disagree with most who say not to worry. However, here’s another thing - when you water that girl now - no need to measure anymore. You should be watering her to runoff every time. However much water/feed that takes (I assume you go feed - water - feed -water, correct?). You should be soaking her then letting her dry and have that nice wet/dry cycle going. And since you’re using chem nutes, you don’t want salts building up in your medium. That can cause a lockout and all sorts of problems. Watering to runoff will mitigate this potential problem, and imho eliminate the need too flush at the end. For reference on this, please see
@Emilya Green.
Edit: after all the rain that is. Lol!