Aha, well it was long ago I input that value there. I haven't thought about it for a while.
If the Oculus Config AND the Settings.xml has NO effect what so ever on the IPD in game there is one more thing to try:
If you're running Oculus Runtime SDK 0.6.0.1 it's possible to move the left and right pictures (not the virtual cameras IPD) apart or together a bit maybe by adding a little tweak in this file:
C:\Users\[username]\AppData\Local\Oculus\NetServer.cfg
"DK2LensSeparationOverride": 0.068000,
That is for when the lenses can be physically moved apart or together to match. I have modded my rift to be able to move the lenses a few mm apart so that it fits my IPD and also tweaked this value as you can see above. I have perfect scale now and a wider sweet spot.
Anyway, what you could try (to simulate changing IPD) is testing changing this value. I think 0.065000 is the default. You have to add the line above to NetServer.cfg since it's not there from the start if I recall correctly.