Confusing O2 readings

[eclipsegsx1736]

I know that using the O2 sensor to tune isnt recommended because it can vary between cars and all, but im having trouble telling if im too lean or too rich. If I just warm up my car and do a pull, the O2 will .95-97 the whole way. If I do a another pull without letting the car cool down while off, the O2 will read .91. Ive gotten it to read as low as .89 and as high as .97 on the same AFC settings, just because the engine has been heated up for a while. I know the O2 will read a little leaner when hot, but should it be varying this much? And which numbers should I be paying attention to, the O2 values just after warming up or the ones when the cars been on for a while?

 

[StreetThisDSM]

Seems normal to me. I like to keep mine at .92-.93 at WOT. Get a EGT or wideband to be safe. Im not a big fan of reading just o2 voltage.