That procedure sounds right the 20 ft lbs is to seat any new bearings. Then back off to loose, and tighten till the slack is just out, in use the assembly heats up and everything expands making the fit tighter.

Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451