Still struggling with steering issues

[speedyspaghetti]

Hey guys -

I've been trying to track down an issue that makes my steering feel loose and sloppy along with a slight vibration I can feel in the steering wheel.

The vibration and sloppy steering is noticeably worse on rough roads, and seems to improve a bit on smoother pavement. The steering wheel shake gets worse on the freeway around 75 mph. I have also noticed that my driver-side side view mirror seems to vibrate while my passenger side one stays perfectly still. So far I have done the following:

So far I have done the following:
New tie rods (inner + outer)
New front drop links
New sway bar bushings (front + rear)
New control arms (front + rear)
New track arms
New trailing arms
New struts (Bilstein B4)
New strut mounts (front)
New tires (Conti ExtremeContact DW)
4 Wheel Alignment
Wheel balancing @ a reputable shop

I have done all of the work myself (except for the alignment, balancing, and tire mounting), but I’ve been to a few different specialist shops and no one has been able to fully solve the issue. The parts I replaced have improved on the issue, but the car still does not feel like it did before this issue arose. Anyone have any ideas? Could this be a bearing issue? I can't really find any play when pulling on the wheels nor is there a noticeable drone at highway speeds. Does the actual steering rack play a role in this?