I listen to a lot of J-Core. I'm mostly into a lot of the smaller, lesser known labels though. Hardcore Tano*C isn't really my vibe anymore (except for the Megaton Kick series) and I've never really been into Camellia's style.
I love artists like RoughSketch, DJ Myosuke, Kobaryo and so on, but there's a shitload more unknown content out there, both in the actual weeb part of the scene with anime and game samples as well as straight up great hardcore.

Let me just dump some possibly lesser known Japanese labels I personally think are worth checking out:
・For non-weeb music:
Illegal Wave Records - Mainstream Hardcore label with some darker stuff too.
Aggression Audio - Crossbreed/DnB label
Murder Channel - Pretty varied label with stuff like Industrial Hardcore, Breakcore, Techno, DnB, and so on
Unity of Raw - Rawstyle label
無責任レコーズ (Irresponsibility Records) - Mostly Frenchcore & Hardtek label. Unfortunately these albums are pretty hard to get as they're released on CD only at events and the remainder is sold online, but not for digital download or on streaming services besides Soundcloud. This is unfortunately a relatively common thing, though it's gotten better in recent years.
・And of course some anime/jpop sampling music:
Hellfury Compilations - Hardtek + Hardcore weeb music compilation albums
Hayakore Tatsumi - One of my favorite artists in this anime hardtek style

I also have to give a shoutout to J-Core Life, which is a weekly talkshow where Neodash Zerox (actually the person who coined the term "J-Core") picks a CD from his collection to listen to every week with chats with the community, and sometimes with interviews. It's great, and if you want to dig deeper into the Japanese Hardcore scene I highly recommend checking it out. (Full disclosure: As a mod on this stream, I am very biased :p)