Oh, I wasn't looking for performance but I wantend to understand how this part of the PCM works.
Since I loaded the new IFR curve (considering LT and ST) and resetted the PCM most LTFT are = 0 and only few are +/- 2%. STFT are most of the time +/- 3/5%.
This for different driving conditions (accel/decel) and outside temperatures (40/70F).
When I only considered LTFT, driving style and temperatures had a bigger influence.
But it's clear: as long it runs in closed loop it doesn't make a difference: the O2's will manage that