From my point of view as a former OC Armament in the days when we had RAF-manned ejection seat bays, the Weber CL-41 seat is a very old design dating back to the 1950s.
When calling it a "0/60" seat, that is before taking any downward vector into account - and there was a significant one here.
Also, the CL-41 does not have a rocket pack and the associated "dial-a-weight" function which adjusts the angle of the rocket pack to have the line of thrust through the C of G of the seat occupant.
It was not until the late-1960s when seats like the Martin Baker Mk H7 used in the Phantom started to get all the bells and whistles that most fast jet aircrew today would be familiar with.
MB H7 Seat:
http://www.ejectionsite.com/f4seat.htm
Weber CL-41 Seat:
http://www.ejectionsite.com/ct114seat.htm