About Speed feats for the Low Class, I remember the anime has a scene of Yuuto dodging a bullet at close range, that should be worth something
About Lifting Strength, we have Koneko lifting Viser, Viser is described as a centaur-like being, with the upper part of a woman and the lower part of a beast as seen
here
The lower part looks like a feline animal, I'll assume a lion, Viser's height is over 5 m, assuming that it is his height from his legs to his head I will subtract one meter to have the height of his lower part giving a height of 4 meters
A female lion has an average height of 1 m and a weight of 130 Kg
Through the square cube law we can know that the mass of a 4 meter female lion would be equal to the mass of a normal female lion multiplied by the cube of the division of the heights
130 Kg * ((4 m / 1 m)^3) = 8320 Kg (
Class 10)