I think by feeding too much, you could create extra phosphates and nitrates in your tank, which would cause a problem. I don't target feed my SPS anything, and they grow great and have a wonderful color. The need Calcium and Magnesium to grow pretty good, and then you can try the other elements to tweak color.
I only feed my fish/corals 3 times a week.
I dont really target feed anything and I just mix it all up with the fish food.....the coral get it eventually.