Jayson finished his contract with Ichigeki Academy June 2013.
In 2005 Jayson Vemoa was recruited and contracted by Kancho Matsui to help prepare his Kyokushin fighters to compete successfully in the K-1. He was relocated to Japan to train Glaube Feitosa and helped Glaube in the same year to win the K-1 World Grand Prix 2005 in Las Vegas. In December 2005 Feitosa placed 2nd in the K-1 World Grand Prix 2005 Tokyo Dome. Jayson continued to help Feitosa to qualify and compete in consecutive K-1 WGP Final 8 tournaments K-1 World Grand Prix 2006 and K-1 World Grand Prix 2007 Final.
In 2008 Jayson helped Ewerton Teixeira in his 1st year of K-1 to win the Japan K-1 WGP Tournament Championship Title Belt defeating Keijiro Maeda in the final at the K-1 World GP 2008 in Fukuoka and continuing to help Ewerton gain wins over K-1 legends Musashi and Jerome Lebanner on his way to qualify for 3 consecutive years in K-1 World GP 2008 Final, K-1 World Grand Prix 2009 Final and K-1 World Grand Prix 2010 Final.
As the Head Kickboxing Instructor of the Ichigeki Academy
Jayson took general public kickboxing classes and has also trained other Kyokushin Champions for K-1, i.e. Aleksandr Pitchkounov gaining 2nd place in K-1 World Grand Prix 2007 in Hawaii, K-1 World Grand Prix 2008 in Taipei and 3rd place K-1 World Grand Prix 2007 in Las Vegas. Takumi Sato gaining 3rd place in K-1 World GP 2008 in Fukuoka and K-1 World Grand Prix 2009 in Seoul, Jan Soukup (Czech Rep.) and Kou Tasei (Japan).
Team Ichigeki until 2010 consisted of 3 trainers Mauricio "Baboo" Da Silva (Brazil), Fai Falamoe (NZ) and Jayson Vemoa (NZ).