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It's most likely an issue with the boost threshold that you're feeling. The "throttle response" issue you're feeling might also have to do with emissions control that gradually opens the throttle plate to prevent running lean and more emissions.
Either way, your new 330i is almost definitely faster than your E90 330i. Your old car just didn't have the problems with boost threshold and turbo lag your current car does.
By the numbers, your old car did 0-60 in 6.2s and the new car does 0-60 in 5.2. Even more, the G20 330i does 5-60 in 6.4s. I couldn't find 5-60 figures for the E90 330i, but it is probably around the 7 second range. So even without spooling up the turbos, the G20 is still faster.
I'm not sure where you get the idea that BMW is "severely under powering" the B48. It's consistently one of the faster cars in its class (2.0T 4 cylinder compact luxury cars). If you want more acceleration, you would have had to go with the more powerful car. I don't know any 4 cylinder car in this class that goes any significant amount faster than the 330i.
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