a/f gauge acting weird. I think?

[WADS56]

On start up it says it's lean, and will slowley climb up to stoitch as the engine warms up. When it is warm and idling it reads stoitch. At part throtal when warm it will stay stoich, but when there is a load on the motor it will move around a little but never go rich or lean. At wot it will move close to rich, but never get in the red (rich). When doing enging breaking it will go a little lean.

I have a custom chip burned for a blower combo, that would explain why it almost go's rich as the rpm's climb at wot. The car runs good no bucking or surging so it seems to be working corectly.