Yes you are correct..Not sure if that power supply regulator is necessary out of the gate but in the process of finding out.
I am not sure one is really lights out better than the other when it comes to sound, just comes down to details of what works best. Having a hard time pulling myself off the upgrade path. But I do have a dealer who will sell me the P10 and give me a years worth of trade at full value if I don't like it