Strange Brown Spots on My Buds

Tranquillo! E solo una carenza di calcio.... è normale a questa età, specialmente se hai abbassato i nutrienti, sarebbe più comodo qualche informazione in più per poterti consigliare al meglio cosa fare... Soluzione nutriva, EC, pH, temperatura....

Those look like a small deficiency, i also have them looking like spots of rust on the sugar leaves... Youre close enough to the end to just leave it, attempt to lower the ph to around 6 to 6.3 and water twice a week slightly. Chances are youll never clear it fully but it shouldn't stop you from achieveing a good yield

Few things from reading your Diary also. Your intake & outake should flow when testing. You can measure it like that. You feed a feed take the ppm over a week. Then on your flush 1.7L of tap (take the ppm) then on the .5 outflow you take that. And you should be seen a dramatic drop in EC with your flush from what you'd be giving her. If it's higher then you're in lockout. But, seeming u done this with 600+ppm and only got back 700+ppm. That's good. Means there was little food in your pot. But, you can measure intake and outake with a full mix nutrient. This is how you know your plant has been eating.

Sry pic 5. Only thing you can do to save as much as you can. Is harvest

Oh buddy Unfortunately that's bud rot. You'll need to get it there and do damage control. Any sugar leaf that pulls off easy. Will most likely, its base will be eaten away by rot. I can see it clear as day on pic 4. That's 100% rot.