Yea you definitely want to give sunflower oil a go: from what I've found it works very well and you will never develop a sensitivity to it since it lacks flavor. I stopped using olive oil after flush #3 because it was becoming very unpleasant.
Believe me It has not been luck that kept me from barfing all these months :) I came soooooo close recently that the only thing that saved me was going into Zen mode :)
Ponder these words wisely:
"If a man Barfs in a toilet and there is nobody there to see it, did the man actually Barf?"