As time goes by it will get harder to find players maybe who have a lot of free time to play, particularly the older crowd where most of the retro Mario Kart players would reside. MKSC had an insanely long list of Japanese competitors i remember, and then not to forget Mario Kart 64 and the famous Mario Raceway Shortcut competition that took the country by storm in 1996 / 1997.
There were a few sites from back in the day, the large one you referred to which Su was on was run by a gentleman by the nickname Mitsuya Mikan. He explained back in probably 2006 time that he wanted to keep his site as a personal project only. Not long after he took it all down.
The same happened with an SFC F-zero page in Japan. Luckily BPA and I managed to rescue a copy of some of the Japanese records from former 1990s / early 2000s record holders as the owner of that site eventually shut it down too. Perhaps they wanted to or they stopped paying for their website.
In terms of strategies, i am asked very often why we boost off road etc and that it is unrealistic. But since when is Mario Kart realistic, the whole invention is an imaginative step away from reality anyway. Agreed if anyone doesn't want to play laps, it shouldn't be hard to check as they are there when you finish each race. It did annoy me a bit when they started to abolish laps when MK7 and MK8 were around, but i suppose there is less to work on then.
Takashi Ogasawara is a very skilled player who attended CDM, unfortunately he is more of a GP specialist, than Time Trial. But having made the breakthrough of someone from Japan join our event was a massive step forward. Unfortunately he couldn't have the time to search for other competitors to get involved on a regular basis. He was due to visit an anime event with Akita last year but i think he had to cancel that trip too as one or both of them were busy. Speaking to Ha Nyan often, they do work some pretty long hours there and maybe not have as much free time as us in Europe probably.
Retro video game events are a great way to find some new skilled players, we have done the same in the UK, and i think Guillaume / Florent have also scouted around in some expos in France too such as Stunfest.
It would be a good move to at least spread the word about the Twitch for CDM, that is our highlight event of the year anyway