Disable turbo boost. Throttling is not directly linked to any temperature sensor, and turbo boost almost instantly causes throttling, which then takes some time to return to normal because of a back-off algorithm.
I’ve used the software that lets you modify all the CPU flags and nothing helps. Killing turbo boost sucks, having a frequency in the 3.0Ghz+ instead of 4.4Ghz+ is brutal when you are single thread bound.