Yellow leaves with brown dots

Well, I’m using AN PH Perfect and i can say there’s too little Calcium in it. Also they advise 4ml/l through the whole flowering stage which is ridiculous. That makes weird NPK ratio with Nitrogen excess. I checked few diaries where these nutrients were used, all show dark green foliage in flower. I really don’t understand why they suggest such a bad recipe and claim their specialist achieved great results 😅. Your issue could be overfeeding. 4ml/l ph perfect and 2ml/l big bud is extreme for such small plant. You water 1,5 L in 35 L pot? Not good idea. You need to make the whole pot moist and water till at least 10% runoff. Then take a sample of runoff and check with TDS meter. If it’s higher than 800-1000 ppm you have salt build up or lock out. To solve that you need to flush with low ppm water until ppm drops to 500, then wait for 2-3 days and check how she’s going. You will know she asks for more when ppm in runoff will be lower than ppm of feed for about 200 ppm.

calcium issues, what causing could be few, from wrong ph, to nitrogen overfeed, then he blocks calcium absorption, would not worry at such late stage, make sure you watering when pot is light and dry, otherwise - overwatering can cause pH swing inside of pot ...

lol it's difficult to get label info on these products... what a joke. waste 30minutes of my time on these shit products, sorry to OP. .but AN fucking sucks a big fat donk. the ppms i read in a forum don't match my calculations by a x3 difference which is insanity even if i have to account for specific gravity.. .which i don't know for sure because i can't find if it is w/w% or v/v% ... even getting basic, necessary info is difficult to find. i give up.. there's no reason it should be this difficult to get information on the ingredients and a guaranteed analysis % for each... it's a joke if you can't, So, this is 10x harder for no reason. figure out how to make due with what you bought, but my suggestion is to avoid this company... there's no reason you need 8 different products..that's a fucking joke. looks like ppl suggest 1/4 strength from instructions in forums. Another really bad sign.. instructing ppl to damage their plants so you buy their 50 products sooner. a bit frustrated searching for simple information every other reputable product readily provides... what a sham company.

lol my bad that's not a ppm calculator that's some more AN marketing tool... my bad.

make sure pH is proper. After that... could be Ca deficiency... coinciding with N-deficiency. The paling at bottom from leaf tip in is N. The dots with no interveinal chlorosis is Ca. The Ca is more concerning... the N is very isolated, so i wouldn't react too strongly to it... unless it progressed very fast recently. Too often "bloom" suggestions cut N too much. If lower than 120ppm, good chance you need to up N ppm 5-10%. Mg deficiency can look like a Ca deficiency, but it comes with interveinal chlorosis too. so, dots without any paling in veins is Ca related. i'm not familiar with resulting EC nor individual nute ppm's etc.. so you'd have to put in the effort to make it ore of an apples to apples undertanding. 2mL of this or that nute will potentially have drastically different concentrations, so 2mL/L doesn't tell much unless someone uses that specific product. looks like AN even has a calculator for you: https://oregon.advancednutrients.com/nutrient-calculator/ if Ca is lower than "100" it's even more likely a Ca deficiency... fwiw, our tap water often has Ca in it, so i put quotes around "100" for this reason as it is not a precise number... it will range relative to your tap water.. e.g. if you use RO, you probably want 120-130ppm of Ca. when you see many symptoms that conflict or confusing to diagnose, it's more likely lockout (something is way too high) or pH related. Not alwys, but high probability. 120-140 N 40-60 P 180-210 K Depends on gentics and environment, but these are good ranges for an every irrigation feed in a soilless context... which is how you shold use AN. The secondary stuff depends on water a bit so these are less specific Ca 100-130 Mg 80-90? S 100+ in general an every irrigation feed around 1.3 to 1.5 EC is good to go with mature plants. 650-750PPM on 500-scale. EC pens convert EC to ppm differently in some regions, so if in europe you'll have to adjust my ppm suggstions. If converted from EC to ppm on 700 scale, it'll be a smaller number. The EC or CF measured is the same regardless of region. strength of light, co2, temps, rh all will impact how much a plant can handle (perceive as a rate.. like per day or per week). if you meet the needs optimally, the plant maintains healthy look. if anything builds up or is lacking it shows symptoms. This is why i give a fairly wide range of 1.3-1.5 as a good target for you... you'll have to read and react from there. tht is only for mature plants. for seedlings better to be down near 1.0 EC or even a bit lower (promix comes with a 1ec charge, for example and in very similar ratios of what i suggest above.. this is no accident even though i didn't use that as a guide. they and JR Peters came to similar conclusions independently of each other).

Overfeeding and locking out

It could, but likely rather from lockout than from too little being given - those are pretty high amounts of nutrients, especially of grow at this point, you have some nitrogen burn signs on your upper leaves too (burnt tips).