I've been running phosphates between 1.4 and 2.2 for over 7 years (readings confirmed regularly via Triton ICP testing). The more phosphates the more nutrients in the water to feed the corals. Phosphates aren't an issue if you have proper filtration to be able to maintain high phosphates and not have problems with nuisance algaes.
I have videos on youtube - under o2manyfish - showing my tank(s) going back for almost 10 years, and you can't find too many issues with my coral colors. Or take a look for yourself right now - Go check out the live webcam at
www.o2manyfish.com
Your hammer doesn't care what the phosphates are in your tank. It's a hearty LPS, and more crap in the water means more food for it to eat. I have literally several hundred heads of hammer (all different colors) thriving with high phosphates.
Regardless, don't over react. Changing Phosphates too quickly one way or the other is going to cause problems. You can't selectively move or add anything in our reef tanks without something else being directly affected. If you chose to lower your phosphates make it a long drawn out process over weeks not days.
But taking one phosphate test result and using that as the excuse for an unhappy hammer is very short sighted. Hammers were being successfully kept in this hobby for many years before anyone was testing for phosphates, or people could keep SPS. I'm sure we have all been to that restaurant with the giant LPS and softies, not an acro in sight, in a tank that has just piles of crap visible under every rock struckture. LPS are not that delicate as long as things are nice and stable.
Dave B