Glad to hear that the manager was helpful for you. As you have seen from the posts in this thread, sometimes seemingly minor adjustments of saddle position can make a big difference.
In addition to getting saddle height, tilt, and fore/aft positioning optimized for you, the other factor is your body getting used to sitting on a bicycle saddle. This happens to all of us either when you first start riding, or at least in my case in spring when I get back on the bike after a winter hiatus. Our sit bones eventually get acclimated to this new activity.