I like the CVCA clamp-on yokes for their ability to adjust to different shoulders.  My petite wife likes the pads about 8" closer than I do, so adjustment is necessary.  Didn't know they make a thicker pad, but I will definitely get them.  My only compaint of the thin pad was that after a few years of use, I found the aluminum frame was diggin into my shoulders rather than the thin pad.  The thicker pad appears to solve the issue.