Weight classes aren't involved.
It has something to do with the recovery of the hit that slams the
opponent into a wall.
Mila
Juggle - PP6P6P or P6P6P or 6PP - Wall Slam - 3P or 2K - 2T --- Tech+1~+2
Bass
Juggle - 6KP - Wall Slam - 6P - 2T --- Tech +2
Leon
Juggle - T - Wall Slam - 6T - 2T ---...