The best way to get a big seeds batch, is to pollinate the same stigma, 2-3 times a day for 2-3 days. Not only 1 time. Even if the stigma's tip became black(successful pollination), keep going with pollination. This will mimic exactly what bubble bees do on tepuis. Also, i got the best results when i pollinate with my finger. I still dont know why.
For the germination, i have 75%+ rate when the seeds are sowed in lowland conditions. Like 30/25C day/night, in full sun and 100%RH. Its quite strange but the results are there. Once the germination occur, put your seedlings back to the HL setup.
I would hesitate still to call Stylidium carnivorous just because of dew under the petals. Plenty of plants have stalked glands by their flowers as defense, and most plants can absorb fertilizers foliarly, especially those with soft glands like these, but are not carnivorous.
I made many feeding tests over the last year, and the ones i fed became much more biggers. Also, when i put tiny pieces of DBWs on the dew, i can clearly see a little enzyme pool around the rehydrated worms pieces, like you can see on pinguicula's leaves when they caugh a prey.
From my point of view, they are clearly carnivorous.