Unhappy with Resistance - What Am I Doing Wrong?

My husband and I recently purchased a Concept2 and were excited to try it based on all the positive reviews. However, we're disappointed with the resistance. Even with the damper set to the highest setting, we don't feel much resistance in our legs. Instead, it feels more like an endurance-focused workout than the strength-focused rowing experience we were expecting.

Is it possible we're missing something in the setup or technique? We'd appreciate any guidance on whether this is normal or if there's something we should adjust.