Aloha Jeff,
I'm sure you already know this but the reason we work within acceptable ranges of water parameters is like Jimbo said. Each tank is different and so long as parameters are within those ranges a tank will typically be just fine. The reason for this difference from one tank/system to another has to do with the variability of each component used in set up (sand, rock, lighting, flow, temperature, etc., etc.) and the organisms, including varieties of bacteria, that populate the tank. (I consider LR an organism.)
When people indicate they are having tank problems, I know it may seem that all I care about is the big four (T, S, A & C) but for a tank where levels are within their ranges, the next thing I ask is ultimately more important, "How are the coral doing?"
So, how are the coral doing?
Also, when Calcium Carbonate is already precipitating from excess Alk and Ca dosing, trying to "get that last little bit" , is not only futile, but hazardous to the tanks natural equilibrium. I would suggest backing off a step on the dosing and let the tank tell you its equalibrium.
Regarding chasing PO4 levels, what kind of food is being fed? Natural foods are better for several reasons. Dry processed foods typically contain excess PO4 (sometimes indigestible Phosphorus compounds) and thus necessitate using more PO4 removal media.
My 2 cents,
Mark
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