Can you post a screenshot of the FIVR window? Make sure the Turbo Ratio Limits are all set to 39 whether 1, 2, 3 or 4 cores are active.
On the main screen it shows that you have Speed Shift enabled (SST in green). For maximum performance when plugged in, change the EPP value from 128 to 0. On battery power, 80 is usually a good compromise.
When Speed Shift is enabled, the Set Multiplier setting will not do anything so do not check this. SpeedStep is the old method for CPU control. Speed Shift is the new method. Anything related to SpeedStep no longer works when Speed Shift is enabled. Intel needs a kick for using two very similar names for two completely different things.
BD PROCHOT is not part of your problem but I never check that option. Your CPU will still throttle if it gets too hot whether BD PROCHOT is checked or not. Disabling this blocks throttling signals from outside the CPU.
Clock Modulation is another option that you probably do not need to check. This throttling method is rarely if ever used on the newer CPUs. Disable this and then run a ThrottleStop log file and have a look in the log file. The Clock Modulation column in the log should always show 100.0. If this is OK, no need to waste CPU cycles fighting against something that is not happening to your CPU.
I would also clear the Clamp option in the Turbo Power Limits window. It is just another excessive throttling method.
Edit - The default specs for the 7820HK show that 35 is the maximum multiplier when 4 cores are active.
http://www.cpu-world.com/CPUs/Core_i7/Intel-Core i7 i7-7820HK.html
Using the 39 multiplier when 4 cores are active is technically overclocking so you might need to check the Overclock option in the FIVR window.