One other option to fix steering rack movement (and thus sloppy steering) is to lock the rack directly to the mounting frame.

To lock up the rack tightly, use these washers:

Outer diameter: 1.45", 36,8 mm
Inner diameter: 0.84" (3/16), 21,3 mm
Thick: 0.144", 4,5 mm

8 pieces are needed, one above and one below the rack. Tighten the bolts firmly and check for tightness after a week or so.