Feed it at the same time every day and it will "train" to open. Mine will open about 2 minutes after I put 1 drop of zoecon in the tank or when I put in a piece of algae for my tang.
I would try feeding meaty food not just cyclopeeze. I buy 1-2 ounces each of shrimp, clam, squidd, mussels and scallops. Chop VERY fine in a food processor, add a few ounces of zoecon and frozen cyclopeeze. Then i spread it thin on a sheet of foil and freeze. Every other day, break off a small piece and thaw it in a shot glass with a few ounces of tank water. Pretty cheap and lasts for a long time!
I put a small tupperware bowl(4x4x4) with holes drilled in the top and sides over the sun and feed it with a joes juice syringe(can buy at walmart for$1). I leave the bowl on for about 2-3 hours so nothing messes with the sun and it can eat all it wants. After removing the bowl,the shrimp and crabs eatany leftovers.
Hurts your water quality a little more than taking out to feed in a "feeding bowl" but saves a ton of stress on a delicate coral not having to remove it from the tank every day or so, IMO.
p.s.- dont worry about feeding EVERY head. Mine has more heads than i could possibly feed. I just saturate the bowl and the coral gets enough to thrive. Many will tell you that you HAVE to feed every head but in my experience that isnt true. I have also read Eric Borneman saying that every head doesnt need to be fed as long as the "whole" coral is getting enough food.
Good luck, they are amazing corals!