Are you sure you're not reacting to puddle? The first overhead is 3 frames slower than puddle according to the frame data, and it seems to be correct. If you were really fuzzying, you'd block low and then high. Regardless, if you fuzzy high to low, the Atrocitus could just mix you by doing f2 puddle.
In real matches imo it's best to just block low until the point of the first overhead, then fuzzy low to high, then high to low. The last overhead is definitely faster than puddle.