Let's do a test, you can give me a frag of each of your corals and i will see if they have PE in my tank!
I always found that my acros took a while to respond to better tank conditions, such as better lighting, flow, water quality, etc. I have one acro that never grew or showed any PE for a year. Now all of the sudden it has rapid growth and good PE. Go figure? Strange thing is I haven't changed anything.
Either way i would give them time. My .02.