transmission hard/delayed shift... not because of MAF

[resistro]

1998 S320 94kmi. Noticed delayed then hard shift when accelerating, usually above 3,000 rpm. NO codes. Saw that some people claim its the MAF, but I checked it accordingly to what my scanner told me to do:

KOEO (spec: .98-1.03v)... was 1.02v OK
Idle (spec: 1.32-1.48v)...was 1.36v OK
@2500 (spec: 2-2.2v)... was 2.16v OK

And the thermistor seemed to be doing its job changing resistance as temp went up. I payed attention to the output on the graph on my scanner and i saw no kind of glitches. So I think the MAF is OK?

I do however have that leak on the transmission connector "conductor plate" that everyone says could be causing the modulator to be bad. Before i try and replace this, can anyone tell me how I can make sure this is causing my problem?