I don't think anyone will see this soon but at least, if there are some new info it should be usefull for anyone who want to run this game. I had noticed this already back on the Game Gear, the quarter circles forward are definitely somehow different than SFII and other fighting games. I may be wrong but it seems that the correct inputs are : "down - forward", without passing by the diagonal.
Sometimes I perform my quarter circles quite well, at a rate of 70-80%, and other times I fail maybe 5 times in a row to just make one. I don't get it here. This is the main reason why I am still around 14min today.
Can we have more precision here ? for example, should I press my button exactely in the same time as the forward input or shall I do it just slightly after ?
On the following link you can find a complete tutorial well structured which will help you to start speerunning this game.
Unfortunately this is now in french, but I hope soon that we could find a place to host a complete translation in english.