Terri, I think you just have to wait a bit more. It may be waiting for just the right amount of heat and humidity. In my area, though we have good heat by summer time, we suffer from poor humidity so my window of time to see blooming is very short, towards the end of summer to mid Fall, when we finally get some much needed rain.
Your media is good, and you are using good fertilizers already. So just wait patiently, maybe towards end of May to early June you will see much more growth.
My epiphyllums are happier this year with the moderate cool down and some rain we got this Spring..but all the other more tropical heat loving plants are waking up slower...plumerias, adeniums, caladiums.
It has been one quirky Spring growing season.
