Have you tried introducing a second male to your breeder male's enclosure/tub? I've got a male here this year that will not show interest in the female I've paired him with until after he's had five minutes or so sparring with another male. I guess he needs a confidence boost before he'll lock with a female.
If not using a second male, then using a freshly shed skin from another male or the sperm plugs of another male put on the back of the intended female might prompt him to start courting.