And yes, the latency is noticeably worse compared to JP without a tunnel, but when I use Pingzapper the difference is negligible for me. I tested it a lot. The VPN service made Titan so much easier on NA servers.

Of course the tunnel helps latency to the JP server a bit too, it has a Tokyo hop. But the point is the difference between VPN NA and JP servers is almost unnoticeable compared to the night and day difference between them without a tunnel (for me).