I had ridden on several week tours this summer with most average days of 70+ miles. The sit bones area was so painful with the pressure on the back rim of the saddle. My ruby saddle was great when riding fewer miles and non-consecutive days.
I bought the neo-powerLG shorts and wore them 2 days at ragbrai this week and had no problem with a painful bottom.
I think you should try your new shorts with your old saddle.
I thought the shorts pad might be too thick in the front, but they worked wonders for me. Best of luck at finding something that works.