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So i felt free to put most of OP's info on a spreadsheet and I think it sheds a bit more light on how abilities and IVs work. The IV inheritance changes slightly when working with Genderless/Male only/Female only species, while it remains the same with normal species.
And the ability seems to depend on whether the parents ability occupies the first or second slot of the species' ability.
We would have to make more testing to see if it is true, but unfortunately I'm on a 100 chain and dont want to break it.