That N. aristolochioides x thorelii is incredible! I've been a bit of a species snob, but i might have to change my ways!
Swords, do you not do any cooling on your highland tank? What are your night temps during the summer?
My hamata has recovered and is also growing amazingly fast (compared the the other highlands). I have high hopes for it! What's the diameter on your vining plant? I'm thinking of building a custom display terrarium just for the hamata, and don't want to make it too small in diameter.