Do you have an app showing (actual and) cumulated cpu frequency? Like kernel adiutor or cpu spy?
Reset statistics and do some moderate work, like reading web pages, where reading far outweighs browsing. Something like that, basically, looking at the screen and not doing too much else. Then have a look at the statistics. If my theory is correct, you won't have the majority at 1728, 1496 and 1190, but lower. If you have kennel adiutor, just looking at the statistics for cpu will give you a feeling for the cpu range. I often have to cores switched off, but the rest does not normally go below 1190. Iirc, it went down to 300 for notable time spans