@Det0x What all did you set in PBO? We are on the same motherboard and bios version.
I just did my first Cinebench run on my 3950x here a bit ago, with Ryzen Master Open, and noted that TDC was limiting me despite being right around 60C through the run. This is the first software I've run that pushed TDC to the limit, as I've mostly been playing with video encoding so far.
So I then went into the bios and raised PPT to 165 watts, TDC to 110A, and EDC to 170A. My results were 9143multi / 510 single with all 3 of these limits hovering at 99/100% in Ryzen Master on the multi run.