This works also for the Benzes. Some old style valves can be disassembled and the spring length can be increased (30mm is a good value) to provide complete filling of the elements.
The larger elements have an increased (and funnel like) bore compared to the originals so there must be some possible gains.
Using vo or even wvo sometimes when the temperature is not reached the fuel supply is not sufficient and in this case increased pressure in the gallery of the ip helps (either from the lift pump or from the tweaked by pass valve or both).

Tom