The G7 series CPUs are kind of like having 3 different CPUs in the same package. There are 3 different TDP levels; TDP-up, TDP, and TDP-down. Each TDP level has a different base frequency associated with it. The TDP level is programmable so manufacturers can easily decide in the BIOS how powerful of a CPU they want. An 1185G7 in your laptop might perform vastly different compared to the exact same CPU installed in a different laptop based on what TDP level and what power limits a laptop manufacturer has chosen.
The TDP level can also be controlled by the computer during runtime. When plugged in you might automatically get TDP-up mode and when you switch to battery power, the CPU might change to TDP-down mode or regular TDP mode. It takes some testing to try and determine what TDP modes a manufacturer has decided to use. Some keep things simple and just leave the CPU in regular TDP mode all of the time.
In your TPL screenshot, ThrottleStop shows that your CPU is currently in TDP Level 2.
Regular TDP = level 0
TDP-down = level 1
TDP-up = level 2
If you want to play with this setting, check the TDP Level box, change the value on the right hand side to 0, 1, or 2 and press Apply. You should see the TDP level value on the left hand side change. Changing the TDP level changes the rated TDP and this also changes the base frequency.
I thought this would be a useful feature to add to ThrottleStop but the problem is that the TDP level can also be changed internally by the EC. That means if you use ThrottleStop to request TDP level 2 and Dell sees that you are running on battery power, the TDP level might still change to TDP level 1, TDP-down mode. There is no way to override the internal TDP level settings. On some computers, this useful looking TDP level control feature in ThrottleStop might not be very useful at all. It will likely only be useful on laptops that do not also use the secondary TDP level setting.
To test what TDP level you are really in, run a simple stress test like the TS Bench and set it to 4 threads so it does not overload your cooling. Check the Disable Turbo box on the main screen. Your CPU should now be running at its true base frequency. This base frequency number typically varies depending on what TDP level you are in. You can change TDP levels while the TS Bench test is running and you should see the base frequency change. No idea if the Task Manager will report this correctly.
I believe that the MSR PL1 and PL2 power limits you have entered into ThrottleStop can override the default TDP values that are associated with each TDP level. That is why monitoring for base frequency by loading the CPU and disabling Turbo Boost is a more fool proof way to determine what TDP level the CPU is really in.
Everything you ever wanted to know about TDP-level.
SpeedStep and Speed Shift were both turned on together in BIOS
I believe this is best. I think the older SpeedStep has control of the processor up until Speed Shift is enabled. That might not happen until late in the boot process. It is possible that if SpeedStep is not enabled then Speed Shift might get set to different values compared to if SpeedStep is originally enabled.
Some bios options are unpredictable. You might enable or disable something in the bios but there is no guarantee that the CPU will be setup to what you requested in the bios when you actually get into Windows. A lot of users swear that they know SpeedStep is disabled because they disabled it in the bios. When you get into Windows and check the SpeedStep register in the CPU, they might find that SpeedStep is enabled regardless of what they selected in the bios. A lot of Asus desktop boards have this auto SpeedStep "feature".
Because of only 8 secs PL2 the temperatures rise only about 4°C
I always recommend setting PL1, PL2 and the turbo time limit to what your cooling system can handle. If the cooling system can only dissipate 60W for a couple of seconds then it makes no sense to set the turbo time limit to the default 28 seconds. One should either lower the turbo time limit or they should lower the PL2 power limit or perhaps a little bit of both. It looks like you have learned how to get the performance - heat balance that is right for you and your laptop.
Edit - My desktop 10850K has a TDP-down mode but it does not have a TDP-up mode. In down mode the base frequency drops from 3600 MHz to 3300 MHz. Not sure if any OEMs ever used this feature on their desktop computers.