My thoughts on this are:
In addition to the DRV on the rail dropping any excess rail pressure, remember that the engine is accelerating under load.
The injector open time will be greater than an idle situation, creating more demand for fuel & dropping rail pressure in the process.
If we also have turbo boost, that again will create more fuel demand at a higher pressure.
To obtain that, the ECU will increase the IMV duty off time to supply the demand, so my thoughts are the text you are reading is correct.
I also second the positive remarks by folk in relation to Mark's assistance.
PS, I've obtained a few bags of Maynards Wine gums to negate adverse comments from Mark in case I'm wrong !!!
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