I don't own a steam deck and I'm not playing in competitive FPSes, but I've been using PS4 pad with gyro to play Elite Dangerous and Cyberpunk. Maybe these 2¢ will be helpful in some way.
What I've found out to work for me was:
- Set up gyro to get enabled with "shoulder/scope aiming"
- Use one stick for looking around, another for movement
- Keep gyro range small and sensitivity low
That way the big movements I do with sticks, when I need precision I switch to aiming and can aim with gyro, and gyro input is less twitchy because of low output range and low sensitivity
I'm a tedious Steam Controller user, and I just wanted to stop by and evangelise about gyro aiming. It's the only way. Ask me about trackpads. I dare you.
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