I Think changing pad width, pad stack height, and using u shaped elbow cups can dramatically improve your condition.
Could you show us how’s your fitting?

1. Widen your pads.
This will increase controllability while you are on the bars

2. Use deep U shaped cups wich can hold your elbows tight. This also improves comfort and stability.

3. Raise your base bar & pad stack height.
Extremey low base bar feels really awful while descending. I also had similar experience on I had cannondale slice RS which had the lowest stack height I’ve ever experienced. For its stem was proprietary and had no angle adjustment (only -17) i had no way to adjust the stack. I come to know that P design svet pro base bar can be used up side down(bar ends are 20mm lower than the center. So flipping this means + 20mm to stack)

4. Slightly tilt your aero bars (praying mantis posture) this really helps alot. It also decreases muscular stress to core muscles.

+ do some upper body strength workouts (back and shoulders) and heavy squats, deadlifts and so on. THIS REALLY WORKS. Trust me.

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Stay home, stay healthy.