New shorts or new saddle?

[BodhiTree]

I'm discovering after riding for about 7 miles my sit bone on my right side is screaming at me and it's not saying nice things.

It sounds like one sit bone (left) is planted nicely on the saddle. It sounds like one sit bone (right) is on the edge of the saddle or even half-off.

Perhaps your saddle is too narrow at your sit bones. Perhaps it isn't wide enough to hold both bones at once.