Most lasers will exhibit a degree of flex, especially when torsional forces are applied. I try to always keep the blade perpendicular to the board, unless i'm making lateral cuts, but the forces are still applied the same, pressure on the too of the spin and underneath side of the handle.
Because Yusuke's are very thin and in my case Special Thin (1.6mm for my 240 Gyuto), very litle effort (force) is needed to cut through products. Its more about understanding the uses and limitations of the profile. For me they're da bomb.