What hub drive were you using? What gearing? Mine climbs about anything without getting close to my lowestHaving changed from a hub to a mid drive the climbing ability of the mid is dramatically better than the hub. Also a major unexpected bonus of the mid drive is the ability to use the power a lower speeds than a hub. Low gearing and a mid drive allow low speeds without risk of stalling/overloading the motor and this is surprisingly useful in some situations such as maneuvering around obstacles or pedestrian traffic.
gear. I´ve never yet used it, even on the steepest hill around here, & that´s mighty steep.