Padding needs to be in your shorts, not your saddle. At least if you are riding for more than an hour or so.

When the padding is in your shorts it will or should be form fitting and move with you as your legs go up and down. When on the saddle, padding can't move with you and just forms a depression around that part of your body that contacts it and then as you move your body has to plow that depression back and forth, wearing a sore into you.

If you aren't in the saddle a long time, then there is a different level of comfort involved that will make for more exceptions to any standardized saddle wisdom for road bikes.

As for your sit bones measurement. Were you in the position you normally sit while riding your typical rides? Sitting up straight and leaning forward will yield two different measurements.