in an effort to prove out my dinkier female Godzilla as an Araza morph, I am trying to breed her to my large adult normal male. This way I should get about 50% normals and 50% godzillas!

I have a 2 year old male 4.5 feet long, and 4 year old female, 5 feet long. I haven't weigher them, but they are very large for sure. They are both definitely mature enough and large enough to breed. They are both virgins and I have put them together twice for 48 hours each time, but they seem lost, and haven't seen them locked yet. I have them together again for the last 48 hours, but with no lock. I'm going to leave them together for 4-5 days this time.
The male has been fasting for 3 weeks and is restlessly always trying to get out of his cage, to get to the female. I don't think he is the problem. I'm thinking maybe the female is stressed? I've only had her for 3 months, and she still gets nervous and sometimes hisses when I come close to her. What should I do to encourage mating?