I would definitely jack up the temp to atleast 80. Mine are about 82.
All I can tell you is to be religious with your WC's and feeding habits and they will breed for you very soon. Keep an eye on their mommy and daddy parts, the female's tube will drop just before she layes any eggs and you will also see very distinct "pits" that they will dig near the spawning site which is for future use/safety of the free swimming fry.
BTW, my PH is 7.5 and my GH is 12, which is by no means ideal for the Orangeheads. It will just be a matter of time before they breed for you. Just stick to your WC's!!!
Jamie