yay mystery solved
Going back to the Male/Female issue, the female PID came from the 10th advancement of this frozen seed, upper32bits XOR'd with 0x10000.
Code:
Test 1: Frozen SEED1 | SEED2 (451E2B75 | 0C325BE2)
D31AA193 Calm Male (26/15/20/18/6/18)
9410760B Calm Female (26/15/20/18/6/18)
D31AA193 Calm Male (26/15/20/18/6/18)
9410760B Calm Female (26/15/20/18/6/18)
D31AA193 Calm Male (26/15/20/18/6/18) speed IV last for all mons
9411760BAD641154 is the 64bit seed for the frame in which it was XOR'd with the usual 0x10000.
9410760B
Now, why on the 10th frame (40th in actual)? Not sure. This won't always always generate another female, depending on the seeds. The nature could have just been pure luck to be the same as well.
Still one place that still needs ironing out.