I've gone through a ton of wuxia and xianxia, but for that pure, traditional martial arts feel, you really can't beat the classics from the 60s and 70s. Jin Yong's Condor Trilogy is foundational, of course, but I find myself re-reading 'The Deer and the Cauldron' more often than I'd admit—it’s less about world-shaking power and more about wit and street-smart kung fu in a historical setting. Gu Long's stuff is a whole different vibe; the fights are lightning-fast, more about psychological tension and one-move victories. 'The Legend of the Chu Liuxiang Series' has that detective-martial artist blend that’s just addictive.
If you want something that feels like a direct transmission from a different era, I’d point you towards Liang Yusheng. His 'The Romance of the White Haired Maiden' and the rest of the Tianshan Series have this melancholic, almost poetic quality to the martial arts. The techniques are described with a weight and history you don't always get in the more power-fantasy focused web novels today. It’s slower, but the reverence for the art itself is palpable in every duel.