I usually get 2 kills per dose of overload/renewal, so I net around 20 kills per hour. Your KPH seems kind of low, and you really shouldn't be using anywhere near that much food or banking. I really don't know why you are having to eat so much considering that you are using Tetsu. But as a word of advice, just keep going at her. You will speed up and start making more money after you get more familiar with her. Sometimes you do get bad drops, but other times you will get 5 lantadyme drops in an hour along with 3 crossbow pieces. It is kind of a hit or miss, but if you keep doing it, it will definitely be more cash than Frost Dragons. You can also try getting the LP boost from burning logs before you start a trip.