Help! -90%ROI

[Statutory]

If you take out one PP million score where I final tabled from less than 1BB with 180 ppl left, I have at least a -90% ROI in MTTs.

I grind 5/10nl for a living and play around 65k hands/month. I have a 15% ROI in up through $100+ SnGs (Sample size in in thousands).

I would like to say LOL Donkaments and chalk this up to variance, but that doesn't accomplish anything. I play all the big Sunday's and can never get anything going. I plan on playing most of the Series including the ME and will really like to show some success before I leave for Vegas.

So, has anyone here been a successful Mid/High SNL player, successful Mid/High SnG player, and not transitioned well into MTTs?

If so, what adjustment or resources helped you make the transition? Even if you only play MTTs, feel free to take a guess at what I could be missing.

Thanks