Usually I'm fine on SFMM's Goliath and Tatsu but on my last visit, I was nearing grey out thresholds on both rides. For Tatsu, I was on the last row where it seems like the G's on the pretzel loop are strongest.
However, I've ridden Tatsu as many as 5 times in row without any grey/blackouts so I'm not sure why on that particular day, those two rides were affecting me so much.