Hi,
I´ve also had low germination rates with Salvia recognita, even with GA3 or cold stratification, but I never really tried to grow it from seed, since I got established plants from Senteurs du Quercy, a french website: Salvia recognita - sauge - plante aromatique, vente en ligne (senteursduquercy.com)
If it´s not ok, to post the link to the sellers website, I will certainly edit it.
Salvia recognita plants seem to like well draining soil and they seem it to like not too moist all the time and can do in full sunlight.
I potted mine in a mix of one third coco coir, one third ordinary garden soil and one third Fibotherm (=broken clay pebbles).
But I guess any other well draining mix would do as well.
Unfortunately I cannot send you any plants, since mine died because of neglection