I have Vectra and Sicce DC pumps on my tank at the moment, I had Iwaki before, the olive green one which, can’t remember, might be the 70. Yes, my train of thought was similar to yours, when I made the switch, I can run two DC pumps at the same time and still use half the power of one Iwaki, I will say, I really like the Sicce over the Vectra. It has more head pressure, more flow, AND uses less power. And it runs cooler as well. The management software needs some improving, but the pump and controller are better.
Hmm, which model Sicce are you using?
-JCL