Sorry to be so late to the party but I'm just getting back to the forum.
The Compact 8 saddle is held to the ways/bed by the bolts up front and a nylon shim (part 4) at the rear. That nylon shim fits tight to the underside of the rear way with zero clearance. It is there to eliminate any lift of the saddle under load.
If you have movement when you manually lift the saddle from up front, check that all the bolts that hold the saddle/apron assembly together. Each should be snug, not overly torqued down super-tight. Then check to see if that shim at the rear is intact and not worn. That is all there is under there.
If the movement is coming from the cross slide on top of the saddle then you need to adjust the cross slide gib. Loosen the gib screws, pull the cross slide tight to opposing dovetail and bring the center gib screw into gentle contact with the gib. Do the same to the other gib screws, making sure each is tightened about the same, and then lock them down with their nuts. Check for zero play in the assembly and you're done.
Emco lathes do not require excessive torque on anything. They rely on superb machining instead of force.