Arc Trainer only working quads. What's wrong?

Hello,
I've been using the Cybex Arc Trainer at the gym for a couple months as part of my routine.
I typically do a manual routine for 50-60 minutes, with most at the highest incline (20) with a resistance between 20-30.
For short breaks, I'll move the incline to 8 or 2, and make sure the resistance is at 30.
I've heard from multiple people that I should feel it in my glutes. I have only ever felt it in my quads. How do I effectively work my butt on the Arc Trainer? Any thoughts?
Thanks!

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