The thing to remember is that each snake is an individual and what works to get one pair started may not work on another. Changing light cycles and lowering temps works for some and for others is totally infective.

Start with the basics if you want to cool fine lessen the light cycle, pair them up at night and leave them for a few days see if they lock, Try this for a couple of weeks even a month or two. It take some a while to get the picture.

If nothing is happening start changing things little by little, when you pair them, who's tub they go in, misting them all these things are things to try.

Start slow theres more than enough time to tweak. People still have clutches being laid and hatching so theres really no rush.

Take it slow, Take Notes and learn and enjoy.