I think the best thing to do would be to minimize hormonal triggers. Minimize the signals of āspringā and breeding season your birds get. This means that you shorten their photoperiod (daylight), adjust diet to reduce fatty, protein heavy, rich foods, avoid āsuggestiveā cage items like shadowy corners, boxes, shreddable nesting substrates, egg like items (for your female), possibly remove special toys your ekkie is fixated uponā¦
Birds come into breeding condition when their bodies receive signals saying that the environment is right for reproducing. For pet birds,That means a longer daytime (light available in birdās habitat), especially rich or hand fed or gloppy food, nest site stimulus (dark corners or boxes or stuff to shred), petting on sexual body areas.
Normally owners of companion parrots want to reduce these confusing signals so their birds donāt come into breeding condition and do some annoying, disruptive, or possibly dangerous (egg laying) behavior patterns. If you wanted to breed your bird you would encourage these things. So when you see extra regurgitation, humping toys, defensiveness of ānest siteā, etc, minimize those confusing signals in your birdās environment and life and you can potentially reduce the hormonal problem behaviors. But, you are not a parrot and you canāt āseeā all the signals and triggers your birds are getting. You can only reduce those that youāre aware of. And your bird needs enough light and adequate fat and protein in his/her diet.
Another option would be hormone antagonists like Lupron, which you need to discuss with your vet. That would certainly decrease these behaviors that youāre concerned about.
The boy conure I referred to was more aggressive and bitey towards me if he was taller than me (had a really high cage) and if he was flighted. But your birds need some height and some ability to escape to feel secure and ok.
I hope this made sense? Itās late and my brain is not at its prime.