At cuise, the power valve would be closed. When vacuum drops under acceleration, the spring/rod pushes the valve open, effectively richening the fuel/air mixture. The four holes in the power valve are .070" each, so the effect is considerable, compared to the two main jets at somewhere near .063".
I'm surprised you don't notice poor throttle response under acceleration with the power valve disabled. One would expect sluggish response with only the main jets in the circuit. I'm assuming you are speaking of light acceleration without the end carbs actuated.. I've never tried what you've done, but would like to hear from others who may have insight into this scenario.
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