So here is how I would analyse it. The general look of the plants are good. Which would lead me to believe that whatever happens you will end up with good
.
At the stage of the plants flowering (week 6) the plant is naturally going through it's stages of putting all energy into it's fruit. I think the spots you are seeing are some sort of nutrient being sucked out the leaves. Perhaps a bit earlier than you want because it's never good to see something you have grown starting to look disheveled and all ropey...but that's what seems to happen.
So it's a 55-65 day flower, you are on day 42, effectively you could be finished in under 2 weeks (doubt you want that...or perhaps you do) so lets say it goes to 9 weeks, that's 3 weeks away, 2 or 3 feeds (depending on your schedule) and a flush, and then a couple of days in the dark. By that time the plants will look like $hit - no prizes at Kew Gardens for their looks (unless you like bud
)
Plagron Royalty mix is organic, you are adding ferts, your plant is using them like a mother fo! Add some more if you want in ur next feed, (I have always thought you were quite liberal with their usage - but then the soil's got goodies as well
) Give them a good flush, then feed them again, and then finish them off with a flushing. But since you are using organics, I would say about a week before chopping you can flush. I use to do it 2 weeks, and I think you will notice the difference if you keep feeding up to week 8 (or the week b4 you harvest.)
Alternatively you could start compensating with adding more phosphorus (which you are doing with the P+K anyway) Phosporus problems can sometimes give dark spots on leaves or make them go reddish brown, make the tips look burnt...but this is whats happening imo anyway naturally.
Or you could also say its a Potassium problem, with yellowing leave veins and burning around the edges...but again, IMO your buds are doing this to the plant (Look at the stinkyness of them
)
So best thing to do, again in my op, is to up that PK 13+14 bru, now, get it in there while the going is good.
Other than that, gonna be happy times in the Baggins hoos fae sure'in
Peace and happy growingness - DST
off to role another fatty of Headband -