Are these leaves worth worrying about?

Having some issues with my soil ph, it's over 7 according to my meter. And I think it may be causing a potassium deficiency in my plants, at least from what I've read and by the looks of my leaves. In my 4th week of flower, looking for ways to lower the pH and potentially raise the potassium, but I'll take whatever advice comes my way. Here's a pic of some of the leaves. NFSOT.

N toxicity, flush then switch to some bloom nutes with lower n

I've had a few people recommend a good flush. If I were to go that route, how do I do it? They're in 5 gallon buckets so how much do I pour to flush?

ph and ec of medium must always be good. always

yes, worth worrying about. add something to your medum with lower ph until desired ph, i.e. coco coir that has known low ph until soil has desired ph. ideally before you put a plant in the soil

you can find other things, or use multiple beside just coco, that is just example