Thanks for the response.
You had stated that PBO is set to auto correct? Can you please change that setting to enabled ? Or better yet. Go to the advanced section and under AMD overclocking /Precision Boost Overdrive select enabled. You should see the options of (Enabled/Advanced/Mainboard/Manual/Disabled) depending on the mainboard manufacturer.
Auto on some bios settings is default for off. You want it to say enabled.
Humor me and install and run 3dmark timespy and post your score. You should be getting a CPU score in the region of 14,000 and above.
After that we can try to work on your software config. You have the hardware to run stock ultra at 4k and not mess with it any further. Also, What is your monitors resolution ?
You did install the AMD B550 Chipset drivers right ?