I find that kicks with a natural peak around 150 hz have a decent ‘thock’ to 'em. you talking about that smack in the chest feeling? theoretically most ppl seem to swear by 120 hz, but 150 works better for me.
also adding harmonics (distortion, another sample, additive eq) slightly around 500 hz is dope. but you don’t want freqs between 2-300 hz, then it gets a bit muddy.