Well in all honesty am not even sure if 0.2 phosphates will cause the pink on HW to be lost . There's a lot has changed like alk too as you are trying higher alk for better growth and it's just the time being that the acros are getting accustomed to the changing environment . If you keep your phosphates constantly high with high alk and return to stability , more often than not the acros will regain their true color .
If you don't believe me , ask Adam how much his phosphates are

. Mine are constantly over 0.3-0.4 and I don't even attempt to bring them down any further .
Anyways , I don't have HW neither such an amazing collection so take my advice with a pinch of salt . But if it were upto me and I want to raise all parameters for a better growth , I would stick to it and won't reduce them .
Regards,
Abhishek