Once you have launched a project, throwing any kind of money at it is a waste of time and effort, merely delaying the inevitable. Were I running it, I would cancel the project before end of next weekend, get feedback from backers and relaunch it in the spring after rebuilding your audience. Audience participation is key in any project, I know it doesn't look like you have a Numbers now, but it is possible to have it later. The current backers you have now are more likely to return if you give them a reason to, such as a bonus perk, you've got all those voice actors, I know I would kill for a billy west as fry voicemail message, you could ask for $300 plus on that pledge tier alone. Peter Dinklage did it on one, Guy I know has Tyrian Lannister as his business vm, hilarious stuff. You need to be really inventive with the pledge tiers, I would revamp several of them, all of the $1000+ ones. You should join some of the kickstarter advice groups on Facebook, they have many resources.