Maybe I just killed a few batches of Salvia seeds through clumsiness, then learned the right way at the same time I started pre-soaking in H2O2.
That's quite likely, but when someone advised doing it that way and they started living, I assumed it was because of the peroxide.
"After it, therefor because of it" ... I could keep whatever other changes I've made in my habits, replace the H2O2 soak with a water soak, and see what happens.
But it is also possible that the seeds I killed were all old or very fussy, and the ones that survived were fresher or easier. I know that even with the H2O2, maybe 1/4 of the varioeties and 1/3 - 1/2 of the seeds did not sprout or thrive.