Here's an update 3 weeks later. This is a mature, one-foot typical. It's planted in roughly 70% red lava rock, 10% of the old serpentinite dust peat, 10% of the remaining serpentinite rock broken into larger pieces, and 10% perlite. The top peat is just the moss topping that came with the plant, but it's still majority rocky substrate. The styrofoam doesn't keep the water cool, and an ice pack only cools it to 60 F for 12~ hours. I stopped using an ice pack after the first two days. The highest water temp was 79 F indoors.
Since a few days ago, the tongues on the mature pitchers and one of the baby ones started browning a bit. I believe it was because I had the tube too close to the crown and was drowning the roots. I don't see browning tongue tips on 2 of the other baby pitchers. I'm trying to reintroduce the ice pack back every night, but if anyone knows what else is causing the brown tongues, please let me know.