When Speed Shift is enabled, having SpeedStep enabled or disabled does not make any difference.
In the FIVR window, I would set IccMax for the core and the cache to the maximum, 255.75. Multiple throttling methods are not necessary.
In the TPL window, clear the Disable Power Limit Control box and check the MMIO Lock box.
The log file shows the CPU running at a consistent speed. No signs of any throttling. Try running another log that goes for a longer period of time. At least 15 minutes of gaming will help show any problems. Exit ThrottleStop when done testing so it can finalize the log file.
The Nvidia GPU speed goes up and down at the start of the log file. Maybe that happened just when you started the game before you started playing.
Your Intel GPU undervolt will not do anything unless you also undervolt the iGPU Unslice by the same amount. I recommend not undervolting either of these. When gaming, the Intel GPU is barely used. Undervolting it is likely to cause instability long before it reduces power consumption any meaningful amount.
For the 8th and 9th Gen CPUs, you can undervolt the core significantly more than the cache. These two voltages do not need to be set equal to each other. Do some testing with Cinebench R20.
CINEBENCH is a real-world cross platform test suite that evaluates your computer's performance capabilities. CINEBENCH is based on MAXON's award-winn
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Bump the core in steps of -25 mV and see if there is any improvement in performance or temperatures. Many similar 8th Gen CPUs are stable at -125 mV cache and -200 mV core and get better Cinebench scores compared to setting both offset voltages to -125 mV.