Jaime your walking a fine line there I think. In your situation params can swing drastically very quickly due to overall water volume. So I would personally error on the side of caution and keep that tank extra clean like you are. But what you could do is possibly try some target feeding say early morning day of a water change. That way you can still keep the tank clean but see if growth is stimulated through target feeding.
See others with larger water volumes can get away with a little excessive feeding from time to time because the water volume and percentages are working in our favor. I can dump some cyclopeez, oyster feast and some Coral Frenzy in my tank and not see a blip on the radar. Where as if you were to do something like that you would probably see a significant nutrient swing that could be detrimental and counter productive to what your trying to achieve.
On that note, and I think I started a thread a long time ago, but I suspect that some morphs are more prone to grow algae and have issues. For example Kedd's Redd's, Bam Bam's, and Radioactive Dragon Eye's always seem to come with a touch or readily grow algae in not so ideal situations.
I also feel that the particular strain of which a z or p came from can have a huge effect or can influence the long term survivability of that polyp.