That screenshot shows power limit throttling at a hair under 20W. The MSR PL1 power limit is set to 20W so the CPU is doing what you are telling it to do.
If you want to try and go higher than 20W, clear the Disable Controls box in the TPL window and change Long Power PL1 from 20W to 25W.
Your CPU overheats and thermal throttles when the power goes up to 30W. You can try setting Short Power PL2 to between 25W and 30W. This might help your CPU from heating up so quickly. You can also reduce the turbo time limit from 28 seconds to 8 seconds or less. With poor cooling, the CPU heats up so fast that telling it to run at the full PL2 power for 28 seconds is usually too much. Not sure why Intel chose this as the default time limit for many of their CPUs. It makes no sense in most laptops.
With better cooling you might be able to run this CPU at 30W or possibly even 40W. The factory cooling your laptop has is not capable of that.
Intel removed voltage control from the G7. That is why the FIVR window has lots of blank space in it. These CPUs would run a lot better if it was possible to undervolt them.