Does French's Cannon need to change?

It is 80HP less than Bombard. Attack high (200-170) 30. Siege is high (400-340) 60. More flexible, no erection required.
The initial movement speed is 0.88, and the initial movement speed of the bombardment is 0.62. Is the gap too big? French’s Cannon’s movement speed is an outlier. It is more appropriate to set its movement speed to 0.75. Also faster than bombard, but the gap will not be as big as it is now.