I am a broadcast feeder myself.

I spot feed my lps here and there, and will usually hit the polyps that show feeding responces, but when it comes to feeding my polyps, I figure they will catch what they can/will. Whatever they dont catch, I can be certain that the food breaks down small enough for the zoas (that show no feeding responce) to make use of it , before my skimmer pulls it all out. I feel very comfortable that all my polyps feed well before all the nutrients are excavated out of the tank with broadcast feeding.

I do, however, turn my return pump off a while, when feeding, to keep the food in the water column for a while.