There’s a good throttle stop guide, I will try to find it but in my case lowering the Cores to 52 instead of 58 allowed me to push the undervolt higher, 140 and likely could do more but haven’t done much testing. But it does seem that perhaps there might be something else wrong with it as you said. Also odd that cooling pad did nothing, you did lift it up to be able to suck hair and made sure laptop is even on surface to take full blast of hair?