i'd always feed light. the rule of thumb i've learned is that it's better to under feed that to over feed. sannie's seeds are grown organically and i use house and garden nutes which are not. i think chemical nutes need to be applied in lower dosages anyway, i use coco btw. i haven't had alot of nute sensitivity with sannies gear cuz i ask and the instruction i've been given i follow to a T. to answer your question, usually sativa dominant plant tend to be alot more nute sensitive but, it depends on alot of factors. of course strain, pheno, size of plant. i start around 200ppms and let the plants tell me what they need from there. let them tell you what they're lacking and you see the best success. i don't pay attention to charts