Kevin,
I just installed the 74mm parts (tb, elbow, maf, original maf sensor,o-ring) yesterday, same symptoms as you have. I performed two throttle resets at different times, this changed things a bit, along with 20 miles of driving. I'm thinking like mrmiata, it will 'sort itself out' with time.

I'm now wanting the EuroCharged tune. I'm beginning to see this upgrade desire may become a serious disease.
John