speaking from experience and from US Site and like to share here :
I think using NSW is ok, It think it depend on the live stock you are keeping also. (SPS need very good water parameter and consistences, so it might be at risk)
Is good to test a few round on your current NSW source first, look for for consistence supplier and then decide. Eliminate those supplier that always give bad water parameter.
Even if you add in NSW, you still need to check for PH , SG, KH and add them accordingly.
A good biological system will help to lower nitrate and P04 fast.
I have no problem using NSW for my LPS , fishes and easy care sps like Monti,
In fact NSW has beneficial elements and bacteria.
just sharing here.