Feed the things! I hear so many people talk about getting max coral growth but rarely I do see feeding. Here is a research article about stony coral (sps in our terms) feeding and growth:
PLOS ONE: Augmenting the Post-Transplantation Growth and Survivorship of Juvenile Scleractinian Corals via Nutritional Enhancement
Pocillopora was used, and it showed dramatic increase in growth with feeding.
Now, I find this super interesting! I have a relatively new frag of Pocillopora that grows relatively quick compared to everything else... Maybe something to consider.