Thanks for the detailed experiences, Gary. Have your sps polyps lengthened? If they have, it's due to your dosing of amino acids (one of your bottles in the Polylab package).
There's hardly any first hand accounts of using Polylab by reefers so your comments are appreciated.
Personally, I firmly believe in carbon dosing (polylab, zeovit, fauna marin, etc) as the best method in lowering NO3 and PO4 and maintaining these low levels indefinitely.