There is such a thing as too much lighting for some corals, but many species of Acros can acclimate to most any amount of light you can throw on to your tank (while keeping it reasonably cool that is).
150W + 65W PC should be plenty over a 29 gallon. My friend (Hyolee on this site) has a single 150W Iwasaki 50KK and he can maintain some color in his SPS. A few possiblilities is the tank's water has too much dissolved organics (happens all the time if you don't use a skimmer or carbon), or simply your SPS corals were more or less brown to begin with. Some of the bright colored ones imported are nothing more then bleached versions of their healthy counterparts. Lavender ones in particular are infamous for browing out in captivity. It could also be your lighting doesn't bring out the best colors in your corals. I've noticed that certain bulbs will bring out certain colors in certain corals (ok, sue me for using "certain" 3 times in a sentence
).
Is this all SPS, or just a few select specimens?