I personally use 4 weeks stratification--6 weeks seems optimal and is what our Sarracenia lab uses. We get fantastic germination but the absolute key seems to be providing high temps (80F) under cover. Lighting with a good bit of infrared seems to be good at getting them nice and toasty warm. I tried 3 weeks before and there was hardly anything that wanted to germinate.
I have used paper towels, too. I put the seeds in, fold up the paper so they don't fall out, use a 2-min ethanol bath so nothing gets moldy, then rinse with water for a minute or so and bag them right up. I used only a small piece of paper the first time, so it actually dried out completely after 4 weeks in the fridge and the seeds never came up. Either plan to rehydrate or use a bigger piece of paper towel. I just wasn't paying enough attention and forgot about them.
And as far as leuco germination, I had the quickest germination I'd ever seen... like under 2 weeks if I remember, on leucos collected by our researchers from Splinter Hill Bog. It was insane. They're still the most vigorous leucs I've ever grown. I had 3 of the progeny flower in 2 years. No joke.
Dionae grows a heck of a lot more Sarr babies than I do, though--perhaps leucs need higher heat or are more specific about stratification needs.