Ignition timing

[XLR8928]

Does anyone know the maximum amount of ignition advance I can put in, before it starts interfering with the fuel injection timing (I assume that the EFI uses the ign for its trigger). I am currently set at 30deg @3000 (about 10deg btdc).
Most importantly, is there anything to gain from more advance (I'm running out of low hanging fruit)
-K

[Danglerb]

Not an issue, 928 bank fires all the injectors at the same time, not per cylinder.