Need good Mystery recommendations. Genre: puzzle-type /whodunnit

Agatha is pretty unHolmes. There's never much of a puzzle there. Holmes stuff can actually be interesting. But still, hardly a puzzle.
I'd love some puzzlers myself

Why would you ask for a recommendation like this. There's billions of crime detective mysteries out there by Agatha and Holmes.
How about some pure mysteries which won't end with "oh, okay, interesting, so that's the perpetrator, that's why he did that and that's how he did that"

If you've read everything by the authors in OP I'd recommend moving on to P.D James.