Actual AF not close to Target

[74pantera]

I have an XFI system. The actual A/F ratio is usually not the same (or close) as the target A/F. It is quite different (usually 1-1.5 difference). I have verified that the O2 sensor is working by installing a separate AF meter/gauge.
At cruise, If the target is ~14, the actual is usually at ~15.5. At wot, the actual is closer to the target (fatter, luckily).

Suggestions?

[TurboNova]

You should start by reading the Help menu.

If your actual A/F does not match your target A/F then your Base VE Fuel Table is wrong.

Are you running in closed loop? If you are not, you should be.
If you are and still not hitting the target then you are past what the closed loop correction will allow.... again the Base VE Fuel Table is wrong.

Every engine will have a different Base VE Fuel Table, I have even seen two engines with the exact same parts have different Base VE Fuel Tables. If you are using one of the FAST start up tunes... they are just that, a place to start.