2014 power steering issue

[jeffw]

2014 Subaru Outback wagon, recently bought used at Subaru dealership. I have a small leak near the reservoir. I replaced o-ring, clamps on return hose (all rubber one), bled system. No more noises, or leaks while in park, appears to be fine. Take it for a spin, vibration still exists while turning wheel at slow speed along with what feels like weaker steering. Your thoughts?