Well time for an update of what I have discovered with my recent rebuilds and investigations into the Corally edition SP12x:
The ball cups that are used for the VCS micro shock are too long, and cause the rear pod to have too much pressure applied, which in turn make the chassis have quite a noticeable amount of droop where the t-bar is. So i sliced 5MM off one of the ball cups, and it seems perfect now.
Mounting the steering ball cups underneath the steering joints rather than on top make for smoother steering. I'm still not sold on the center point steering at this point in time, as i have noticed that when you have the front wheels pointing one way the inside tyre has a rediculous amount of slop. I'm thinking of getting some associated steering links (but still use the 12x front end)
Filing the plastic clips that hold the king pin on (where the front ride height adjusters are) so all of that sits more free, and has less resistance. they should be able to move smoothly when not attached to anything and just moving the chassis around in the air.
more to come