Love, love, love ampullarias!
My N. ampullaria 'Brunei Red' largest pitcher
My N. ampullaria 'Lime Twist'
I like this one so far, I haven't found it to be as unstable as yours seems to be yet. Some pitchers with a lot of red striping on the peristome, and some like this one with next to none. I haven't had it long though, so I guess we'll see?