If you’re saying it is your sit bone then I would actually suggest it is the saddle that isn’t right rather than you need better tights. Are your lady bits sore over longer distances? You need to go to a shop that will measure your sit bones so you can get the appropriate width saddle.
Without being too graphic is it actually the bottom cheeks that are scoured and if so how? There is so much more to this, is there a chamois seam that has rubbed? Was it wet that has exacerbated this?
Otherwise tights wise it is personal choice but you also need to do research into the companies to see which chamois is designed for long rides, unfortunately internet shopping you don’t get this information provided. But the buzz word in cycling is “our 6 hour pad ..” so therefore something more appropriate for what you want.
I have a variety of bib tights, Ale and Giordana FRC are my most comfortable long distance ones, Altura progel are better for shorter distances. you need to physically see pad, is it smooth? does it have creases and seams?
Does this all make sense? Sorry I haven’t provided you with the obvious recommendation that you wanted but I don’t think it is that simple.