Try starting them indoors next year and transplanting. I would think you could start yours in February, since you are probably zoned higher than me at zone #5.I never get any because they don't grow and produce for me....I'd be delighted if they produced and folks ate them! We like to cut up sugar snap peas into our salads, so that's the only reason I want to grow them, but sadly, every year nothing happens....piddly little vines come up and no peas to be found.
Maybe skip the soaking. I don't soak mine most the time and they sprout fine. Maybe yours get too wet with soaking and planting in clay soil?