sorry i can't help you, but you bring up something I've wondered about for a long time and maybe someone could shed some light on. It could be that only that small percent should have sprouted. Where did you get your seeds? I went to a bunch of south alabama/north florida saracenia flava patches after they flowered and the seed pods were forming. Every single one of the pods in every patch (sometimes separated by five/ten or so miles) looked rotten/infected/bug-eaten. The saracenia flavas I bought from the store and raised at home (@ 300 miles north of the patches but still in an area where they used to grow native) all have their seed-pods rot every year. They grow outside in the same "natural" environment they would have grown if they weren't eradicated by development so it's nothing I'm doing. I'm 90% sure its a fungus. I've never even tried to collect seeds from those pods. They don't look viable at all. Maybe naturally the vast majority of seeds rot?

I bought my seeds on the internet, I don't think we have sarrs growing in the wild here(Belgium).
It's the first year I have sarrs so I'm still trying to find out how things work. As for flowers ,I don't think I have to worry about them until next year or even the year after that(I bought two sarrs this year but I think at least one of them isn't old enough yet to flower)