Very cool experiment Tony, but some things I think you might consider if you're going to continue experimenting.
1) Isn't S.Boulardii a good yeast/probiotic? Also this test only proves that in the environment with only honey(food) and S.Boulardii, Vit C kills S. Boulardii
2) Wouldn't it be more beneficial to do this on fungus/yeast that is pathogenic?
3) What about repeating the test for other probiotics to see what good bacteria it kills? (Although I think this is less pertinent since the SB is supposed to be pretty sterile ideally right?)