FW13 AMD 7840u thermal throttle at much lower temperature

I am using a 140W DC PD adapter. FW13 can use 20V 4.5A, with some ectool configuration, I set it to 4.9A, when battery is charging it can draw more than 60W, up to 4.2A or so. 60W PD also limited to 2.7A, thus 54W.