i've always believed that there's no way to overskim,
i think that replentishing chemicals is a small price to pay for having a clean tank. but then i dont do sand , or feed my corals either.
considering that fish pass 90% of the nutrients they consume, i see no need to directly feed my corals. basically i want my tank as baron as possible, if there's nutrient in there, it's because i put it in there. keep in mind i also have sps, i know there's plenty of softies and lps that really benifit from being directly fed. i also run carbon 24-7, so alleopathy is kept to a minimum.
i realize that this is an extreme way to run a system, but this is how i get the best results.
i think that high flow, and purified water are probably most important though, with massive skimming and carbon being after that, imo.
there are so many ways to do this, be wary of anyone who says "this is the best way, everyone else is wrong"