I have a dell g5 5587 with i7-8750h and GTX1060 Max-Q

The problem im having is power limit throttle after 40-60 minutes of gaming the cpu drops to 0.8ghz and with it the gpu. I tried everything Intel XTU throttle stop afterburner. I undervolted to every posible level, I tried speed shift on diferent levels i turned off turbo boost and other settings ant nothing works even with thermals at 70-80*c it power limit throttles.

The question im asking is there any way of disabeling the power limit or rasing it?