just gave hitman a call, he rekons i shouldn't be running anything less than 98 oct since fuel in japan is stronger. He recommended runing it till its empty, and then fill up full tank of ultimate, and if its still pinging to give him a call to book a tune. I think I might end up going with Hitman instead of CRD, did a search and most guys here have had good results from him, as well him being cheaper
I'll let yas know how it goes.