Based on the information acquired through Multiple Choice, it seems that Zhang Yanhang's current situation is a special augment brought about by the deepening of his body's energy quantification.
Specifically, after the deepening of energy quantification, his body seems to become more 'sensitive' to certain bonuses. Of course, considering that this statement might sound a bit odd, one might also refer to it as 'excess bonus', allowing him to enjoy a portion of additional bonus.
In other words, although the original bonus effect of the Eight Arms and Eight Feet sub-attribute, Flying Sand and Rolling Stones, might only be 120%, it actually exerts more impact under the support of this excess bonus, which is why his Movement Speed increased more than he imagined this time.
