P0430 and fuel trim issue

Chasing a P0430 - new cat and Motorcraft up/downstream O2 sensors on Bank 2. No other codes. Slight shudder at idle.

Seems to be engine running rich—-

Bank 1 long term fuel trim solid 0 at idle, STFT floats a bit but generally steady at 2.3.

Bank 2, on the other hand, LTFT sticks at -4.7 while STFT sits at 7. At idle, LTFT never comes of -4.7, the STFT will float a bit.

What should I be looking for at this point?

2015 Ford F-150 3.5L Ecoboost.