Nice pics.
It normally takes males longer to become mature.....hmmm sounds like real life
He seems to be pretty good sized, possibly one of them isn't quite ready yet.
Like someone else said sometimes they need to be seperated, what lots of people do with large aggressive Centrals is put 2 tanks side by side so the fish can see eachother. The male coming up to the glass shaking and what not will stimulate the female and when you notice her tube you can put them together. Problem is you need the space to have 2 good size tanks sitting side by side.
Another idea is a divider with a hole in it just big enough for her to fit through, that way she can escape him if needed. Or you can use egg crate to divide the tank and they should lay the eggs near it so both male and female can do their thing. I personally hate divided tanks and I do not do it, however I have lost some very nice fish by not doing it, most recently my new male Paratilapia Polleni when my female went crazy.
Also your jags look great!
Brian