Even though the Mabuchi 550 and 555 have high stall currents, you can still run them with command control. I upgraded a couple Williams Niagaras (550 equiped) for two local clubs using ERR Cruise Commanders and they are still running today even after logging hundreds of hours. While running currents are higher than a comparable Pittman they are still a fraction of their stall currents.
My personal engines get Pittmans but its not necessary to replace a Mabuchi for every upgrade.
Pete