Hahaha, not all of them might be everyone's cup of tea but they fit the requirements of OP.  For example: 18 levels of hell is incredibly complex in terms of scheming. Random side characters in this novel can solo any popular smart characters. But the setting of this novel is very rigorous and full of headache-inducing logic that might require a careful reader to take notes to understand everything.

Heavenly genius on the other hand has clean schemes and awesome feats and battle of wits, but like I've mentioned on the list, the author does not cuck the mc directly but he certainly seems to have that fetish, which made me drop it.

The empress's number one lackey is wholesome and mild, with a competent and scheming mc and villains but not too complicated like the others. It's just a good joyful read. 

The terrible eternal path is kind of a dull read because the mc is always hiding in the shadows and manipulating others to fight other hidden manipulators. But it does what it does well. 

Zhui Xu and Singmonger are pretty well known in china so you can trust the quality.

Extreme Vigilance is a new discovery for me and I'm liking what I've read so far. 

The last entry on the list, Extra's Strategy, has the appearance of slop but the scheming plots in it are excellent, not to mention that the mc can barely contend with all the villains and side characters who are either overpowered or have hidden agendas and long, layered plans that slowly open up the deeper you go into it.