Will adding powerheads really help my Acropora growth

I have a 4 year old reef tank of 150 gallons. I have had SPS corals
for approximately 1 1/2 years which have grown but sometimes not
maintained the color I desired. The SPS corals are kept in the top 12"
of the tank under a 250Watt HQI pendant. For about the past year I
have had a deep blue Acropora tortusa. It has indeed grown, and
maintained excellent deep blue coloration, probably increasing from a
single 1/2" frag to a multiple branched specimen about 3" tall. My
question is regarding the flow in the tank. Most sources recommend
high flow for SPS corals, but I have relatively low flow around my SPS
corals. Due to the shape and arrangement of my tank, it is difficult
to position a powerhead to give flow to the tank where the SPS are.
Should I simply not mess with what appears to be working, or perhaps my
corals would really do much better with some powerheads constantly
circulating water around them?