Well, it's your tank, so do what you like. But raising P04 is certainly not the route I would go.
If low P04 is so bad, then explain to me why ocean water is typically less than .03 ppm and as low as .005. Here is what Randy Holmes-Farley has to say about that. Do you think he is wrong!??
http://reefkeeping.com/issues/2006-09/rhf/index.php#1