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Eland, I guess I never tried (on purpose, that is) shooting BIF in "One shot AF" mode, so you are way ahead of me there.
However, I think Servo AF mode should work better on BIF, with preselected center AF point only.
If you'd like to challenge the camera and see how much difference that (-3 EV) AF sensor makes, these are a few ways of doing it:
(1) Low light level on the target.
(2) Low contrast target
(3) Target small in VF
(4) Target moves towards the camera, straight or oblique.
(5) Target is fast
(6) Mottled high contrast background, not very distant
Peter, I took note and take it as a homework from an X-man. But dont press me too hard. BTW: you were thinking of taking BIF (bats in fly)