I've had good success in the past using Rapid Rooters till I ran into some damping off issues. Now I'm back to soaking, then right into the soil and covered over with some finely screened peat moss.
Soil temperature is one aspect of germination that is often overlooked. If the soil is too cold they won't germ well, even if they were soaked and cracked before planting. I've got some seeds soaking right now that I'll be planting this afternoon. I filled my starter pots yesterday and brought them in from the garage where it's pretty cold. I turned on my heat mat, placed the trays on the mat and turned on my lights. By the time I plant them today the soil should be good and warm.