yellow stain on leaves

definitely overfed, but also check your pH -- they both are potentially correct. If pH is off and it's only slightlay overfed, could be a micronute lockout, which is rare issue and more likely caused by pH. More than 1 thing causes those sorts of spots. Download a leaf symptom chart from a google image search. Learn differences between mobile and immobile nutes and how you can use that to distinguish between some things that look the same otherwise. Extremely lush leaves are a sign of overfeeding. Clawing tends to occur with it too. Seeing previous question, looks like pH has been an issue in past... so just double check that - soil slurry or runoff... Don't expect those to be precise, but if they are leaning one way or another expect it to be a little further out in that direction from "7". If you do a slurry, always use same volume of water and a known/consistent pH, otherwise you'll be interpretting different results caused by the inconsistencies as much as anything we are concerned about.