fertilizer is useless for me. Bugs, insects, arachnids, small vertabrates, etc...are THE best kind of "fert" you can get. Its what the plants evolved for, its what they want! If they wanted more nitrogen, phosphorous and potassium, they would have evolved things specifically for that, but instead they have means to catch small creautes (which have tons and tons of good nutrients!)!
If your flava was overflowing with flies/wasps/flying insects (such as a few of my flavas), i believe you would see very similar, if not better results (such as what im seeing-and very happy to as well! more prey will cause the plants to make more pitchers; think more food for us=faster metabolism).
Bugs for life lol!