... or unless the hydraulic power control units don't have the force to overcome all of the airload. Even with 3000psi hydraulic pressure, that's a possibility since the PCU ram usually has a small piston area (so its a very high pressure but over a small area) and the PCU usually has only a small arm to apply the force (because you don't want a long lever that will protrude further into the airflow).
Since you don't want large control deflections at high speeds, being "hinge moment limited" isn't really a bad thing, but it does complicate other parts of the design if you are.