I was thinking to write to reverse pottery-writing with BW, so we can hire some scientist, but this probably will delay the library, thus we can be in a worst position.
What comes in mind is that with a so tight race, if we want the Oracle, we can probably move pottery/writing after PH. Better privilege growth at this stage and chop libraries later.
Then, my reasons to pursue the Oracle:
1) with a so poor start, a free expensive tech can make a huge difference
2) as usual when you build a WW, you deny it to your opponents
3) to enforce 2), if there's an AI which can build the Oracle before turn 65 it has to be a monster, thus deny it a free tech can be important to win the game.
Last, remember that to win the competition we have to win the game