A couple of thoughts... Love my blond naso and they are super chill.. mine is a total baby.
In regards to redfield ratio.. I think that one is a bit of a red hearing. Yes, it is the ratio of nitrogen to phos found in photosynthetic organisms but that doesn't mean that their environment should match that ratio. From "THE MAN" Randy Holmes Farley..
The Redfield ratio, or any ratio like it, is the ratio of elements in various organisms. Exact ratios aside, all organisms have high C, less N and much less P that composes the organic molecules of their tissues. So in some sense, these are the ratios that photosynthetic organisms will be taking up out of the water (with some exceptions). It is not, however, to be thought of as ratios of elements that should be in the water, and in the ocean, the available nutrients do not necessarily follow that ratio.
At any rate, as many have said, and it sounds like you are doing, having a lower alk will likely be beneficial to you. You have to remember that natural sea water is around 7. I am all about having faster growth but I think that pushing alk into the 11 and 12 range can be dangerous. There are certainly those that do it, but I don't know if that is a great reason. With numbers that high, even bringing new frags and colonies into your system would be stressfull. Jumping from 8 or so dkh to 11 in an hour or so... yikes!