I'm not an expert and this is far beyond my knowledge, but my CPU had a limit of his base stock speed (3,7 Ghz), not a lower frequency.
https://ark.intel.com/content/…cache-up-to-4-70-ghz.html
In throttlestop you can't lower it below it's base stock, only set a max on a number of cores. I use a tool in there called Speed Shift - EPP (energy performance preference) which is a sort or likeliness the CPU reaches his maximum performance or is closer to its minimum but all automatically. My default preset is a low energy performance preference where it almost never goes up from stock speed (in games is usually quite stable at 3,7 Ghz), but as I mentioned it is not manually set.
Don't know if it still fits in what you are saying or not...