Do you think it's even neccecary? I've had it runnning for the last 5 days or so and with it set at 38f I haven't seen the freezer on very often...which leads me to believe its pretty efficient as-is.
Blue is denser than pink if I remember right (been a few years)
If it is holding with no major draw then it's your decision. Personally I would just because I would rather do the overkill and not have to worry about it later if it does need it.