Leaded Fuel vs. O2 Sensors.

[BLOWNDFIZ]

OK race gas guys give me all of your opinions on leaded fuel. Typically I run 94 octane Sunoco unleaded with 15 psi. I have the tune extremely safe, and the knock sensor has yet to show any true detonation on a log. Car made 559 RWHP @ 9psi and 22 degrees timing. Now I'm at 15 psi still @ 22 degrees timing. I hear I'm leaving quite a bit of power on the table and should be able to up the timing to near 26.

Last year I bought 15 gallons of VP MS103 unleaded and mixed that with the 94. Well we have a gas station right down the road from me that sells 110 leaded out of the pump. I'd still probably mix it with the 94 but my question is how will this really affect my O2 sensors? My DFI wideband is an NTK which are supposed to be leaded fuel resistant. However the Autometer wideband on the car is a Bosch, which I hear are not as resistant. Then on the nitrous car I'm running stock O2's and I'm pretty sure these don't like lead at all.

Let me hear your stories....

TIA!