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I would urge you to separate transient response from a linear increase in power.
I have run many tests (with a full data acquisition system) on engines in race conditions. Increasing throttled volume has ALWAYS decreased the TIME from throttle actuation to RPM change. However, the rate at which the RPMs increase once the RPMs do begin to change may be higher. So much higher that after as little as .3-.5 seconds the larger plenum would be at a higher RPM, but it had a longer initial delay.
Throttle response is the time between throttle actuation and the appropriate change in engine behaviour, not the amount of change.
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