After a long search I finally found a set that has both green bamboo and red fives to replace my YMI set.
After introducing some friends to riichi mahjong that I now regularly play with I decided to invest into a nicer set. Made a little comparison shot for a friend and thought I might share it here as well.
Thanks! You are correct, the one on the right is my 30mm green YMI set. The new one (at least if my research is correct) is a color variation of Matsuoka's Tenwa set