Temperatrue were still bad, throttling still occured, but it was a little better. Time the let some air flow beneath the laptop, and for some serious undervolting. I made a stand out of aluminum corners, and 3 modes in Throttlestop: performances, sticking to the turbo x31 @ 3.1Ghz as much as possible, a silent battery mode mode with max x30 turbo, and a battery mode with turbo disabled. All set to -125mV for the core and -100mV for the cache and GPU. I tweaked the TPL so the CPU sticks to the x31 multiplier in performances mode with no limits or throttling. The room temp is 22.5°C, after 25min of cup-Z stress, core one reached 60°C, sticking to 3.1Ghz.