I grow a number of them, all grown in lowland condition.
The media I use are sphagnum moss + perlite (mostly TC plants) for plants grown under the pergola but I have to really monitor it closely, they are prone to dry-out especially during hot season like now. Pitcher sizes are about 3-4", some are beginning to produce intermediate/uppers.
Other plants are grown in clay-like media that I get from the the local aborigin seller. This plants are grown among shrubs & at the edge of the house (a bit shaded) and the pitchers are 4-5" and there are some 6-7" too
In regards to humidity, it's quite humid because I have a lot of waterplants in big containers around the area I plant them. I even have a long narrow aquarium right under the rack where I put some of the sanguinea & their hybrids.