Too much flow for sps?

[Son Of Skyline]

I've just finished converting my 27gal to a full sps tank, starting with frags and a single mother colony. How much water flow is too much? How bad is it to have an acro directly in the flow of a powerhead? I seem to be having trouble getting good even flow without directly pointing the powerheads at certain corals. Any suggestions on how to go abouts creating good water flow? Thanks!