I have the DFS version of the Strawberry Shortcake, I forget what they call it....I keep my frag up high and to the left of the direct lights and it has kept the intense green. I have very red polyps...when they peak out, not much polyp extension on this particular coral in my tank. The pink corallites are somewhat muted, really muted compared to that picture above which is incredibly gorgeous

. I think as it grows and develops into a colony I will get much more of the pink corallites. Try moving yours up into higher light and see if the green returns.
I've noticed that my Tierra Del Fuego has really colored up as it has grown. The pink has developed tremendously. It is a much faster growing coral than my DFS shortcake.