Did you try hitting your molding surfaces with a fungicide? I use
Benomyl, but I don't know if it's available in your area. It's usually
a good idea to apply a fungicide to the seeds and media when sowing
seed. Peat and (especially) milled sphagnum are notorious for providing
a breeding ground for mold, especially at low light levels.
It would also be a good idea to put your Sarracenia and
hibernaculum-forming Drosera seed in a cool place for 6 weeks after
sowing. This cold-stratification process greatly increases your
seedling yield. Popping the seed trays into the fridge (temps of 2-7
deg C) works pretty well. This will "fool" the seeds into thinking that
they have endured winter, so they will be ready to sprout when you
introduce them to warmer temperatures.
Good luck!
Doug