Before you scrap the Aqua Medic, give it some time. If the gas starts building up at the top of the reactor, then there will be more turbulence as the vertical section of gas increases. Give it until the end of the lighting period and then decide.
Bump: ...But yes, the higher the flow value, the larger the diameter of the reactor that is ideal. So it should, theoretically, work the same in reverse. Just trying to save you some work and cash.