I finally got my RAM to post at 4000 MHz after using manual timings and setting the CPU to Auto and using PBO along with Curve Optimizer. Before doing PBO with Curve Optimizer, the RAM would not POST above 3800 MHz with manual timings. Also after doing the Curve Optimizer and changing the CPU to anything other than Auto, the system would not POST again.
I used DRAM Calculator for Ryzen to get the manual timings and voltages to use. I used the 3800 MHz timings and a 1.40 DRAM Voltage to finally get it to POST at 4000 MHz. One thing I did have to change is the first 4 timings to 16-16-16-32 instead of 15-15-15-30. My RAM is G.Skill (Samsung b-die chips) and are 2 same specced 2 x 8 GB kits for a total of 32 GB which made it POSTing even more surprising.
DRAM Calculator for Ryzen