Some people recommend putting a different males shed into the enclosure with the pair. Supposedly this will help stimulate the stubborn male and push him to breed. I've never personally needed to try that, so I can't speak with experience.
One thing that has worked incredibly well for me has been to pair up during storms and the accompanying pressure changes. Unsure on the science behind it, but this absolutely seems to help get some breeding kick started.
Good luck!
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