Do note also that Weileong's MX70 used 172W through one injector whereas my MX100 used 228W through 2 injectors.
Using 2 injectors would allow more water flow and thus wattage goes up as well, I won't be surprised if the mx100 through one single injector would be below 200W as well because a single bottleneck would restrict more flow and as flow goes down, wattage goes down as well.
So although using the same pump on dual injectors will use up more wattage due to overall more water flow thru both injectors, you would also be getting more air sucked into your skimmer as well, which ain't a bad thing.
At the end of the day, the higher the wattage drawn from the iwaki, it means more water is flowing through the injectors and more air is sucked into the skimmer