I may be mistaken, but i think saddle break-in is limited to leather saddles. For the other ones, if it hurts on day
#1 , it will hurt just as much on day
#1 00 (unless your arse HTFU).
The pain you describe is not something you want to ignore. Get a different saddle, or play with the tilt, forward-aft position, height, etc. until that sensation is nothing more than a bad memory.
If all else fails, there is always this:
If I were you, I would try a Brooks or something similar.