4 Strains, 2x4, LED grow

it is week 7, day 55 of flower. some things went wrong, I tried to do something for the mites again, so after I was worried bout spraying iso and water I tried h2o2, tested 3% on some leaves first, as all the "documentation" on the net is very missleading. you read everything from a 3% h2o2 solution can be sprayed directly on leaves... and stuff like that. what they mean is 1/10th of 3% or something. 1 part 3%h2o2 and 9 parts water, which would result in a 0.3% solution I think.. well ok I tested this.. then I realised people are just stupid. some even think cause they are using a certain h2o2 product, everybody uses the same. man so many people just write "you can spray a 3% h2o2 solution no problem" or shit like that. ok after realizing such statements are false, I mixed it to 0.3, tested again, seemed ok... but after the whole spraydown there are still spotted leaves from the weak solution now.. white spots.. great. I even did approx 0.28 h2o2.. then I realized that it probably wasn't that good to spray this stuff with a brass nozzle on the plants... not so nice on the buds cause h2o2 is an oxidizing agent, altough the ammount of dissolved copperoxide and zincoxide should be very very minimal..... most people probably wouldn't even give it a second thought... a recomendation for any type of plant spraying from my side (especially if you have to treat in the budding stage), is to get one of those acid or chemical resistant plastic sprayers... they are all plastic, nozzle, tank, plastic coated springs against corrosion... most are made from PP or PA, depending on the usecase.. I think both are ok for h2o2 mixes... but I will still be doing a budwash at harvest day as I am allergic to dust (cause of mite shit and their bodies in it) anyway... so it will probably the most clean bud I have ever smoked after the wash despite the copper spraying that probably mostly exists only in my head.. lol... the white spots you see in the pictures are mostly from the 3% test spray.. I also forgot to take a clone from the best purple kush I think... I took a small one in flower, but it died... tried to root it, damn... as is is by far the best pheno, the only one that went full purp mode and with nice, wide fatty buds, i has the best bud type of them all... so I might try to cut one more branch more with smaller buds on it and try to root and re-veg it. the kushs already look almost ready to harvest.. other than that I might have overfed some miniscule ammount... I just reduced the micro and grow parts and bumped up the PK a bit (hydro schedule on the first gallon cause I confused that...).. I then fed these 2.5 gallons with quite some drain to flush just a bit to not drive the ppm in the pots too high and get an even new nutrient level. my h2o2 treatment probably caused more harm than the few mites I had on my plants.... but still it is looking pretty good and everything.